The sodium thiosulphate is added to the conical flask until the solution in the conical flask becomes straw-yellow colour. The starch indicator solution must be freshly prepared since it will decompose and its sensitivity is decreased. Transition Metals & Organic Nitrogen Chemistry, 5.1.3 Measuring Standard Electrode Potential, 5.1.5 Thermodynamics & Electrode Potential, 5.4.3 Benzene - Electrophilic Substitution, 5.5 Organic Chemistry: Nitrogen Compounds, 5.5.1 Amines, Amides & Amino Acids - Introduction, 5.5.7 Characteristic Behaviour of Amino Acids, 6.1 Advanced Physical Chemistry Core Practicals, 6.1.1 Rates of Reaction - Titrimetric Method, 6.2.1 Redox Titration - Iron(II) & Manganate(VII). How to translate the names of the Proto-Indo-European gods and goddesses into Latin? I thought only $\ce{NaI}$ is produced after adding the sodium thiosulfate. I. How is a standard solution of iodine obtained? How is iodine produced in the persulfate-iodide reaction? So when you added starch $solution$ to heptane which contained iodine, I would not be surprised if the starch solution turned blue. What happens after the sodium thiosulphate is placed into the burette? Starch solution is used as indicator. What reasoning is from general to specific? Dissolve the sodium thiosulfate, sodium ethanoate and sodium hydroxide together in deionised or distilled water and make up to 1 dm 3. What happens after the sodium thiosulphate is added and the solution in the conical flask becomes straw-yellow colour? A few drops of starch indicator is added. By the amount of KMnO4 used (limiting reactant). Just clear tips and lifehacks for every day. By clicking Accept All, you consent to the use of ALL the cookies. ClO- (aq) + 2I- (aq) + 2H+ (aq) Cl- (aq) + I2 (aq) + H2O (l). If you continue to use this site we will assume that you are happy with it. How is iodine removed from the reaction mixture? Preparation of 0.1 N potassium iodate: 3 Why is it called iodine clock reaction? What are the solutions to the iodine clock reaction? Browse over 1 million classes created by top students, professors, publishers, and experts. Iodine reacts directly, fast and quantitively with many organic and inorganic substances. Experiment 9: Titration with Sodium Thiosulfate Briana Graves CHE 2121- Quantitative Analysis . The Starch-Iodide complex is not very soluble in water, so the starch is added near the endpoint of an Iodine titration, when the Iodine concentration is low. The titration reaction may be represented by the equation: I 2 + 2S 2 O 3 2- 2I-+ S 4 O 6 2- (Note that in this experiment a standard solution of iodine is used to standardise a sodium thiosulfate solution. The precipitate can be removed by adding a bit of ethanoic acid. Sodium thiosulfate is used to reduce iodine back to iodide before the iodine can complex with the starch to form the characteristic blue-black color. If we add 2cm of starch solution, the reaction mixture will turn dark blue to indicate that iodine is still present. A standard reaction used to calibrate a solution of sodium thio sulphate is as follows: Acid and potassium iodide are added to a solution of potassium iodate getting the following reaction: represented by the following ionic equation: Thiosulpathe is titrated against this solution (effectively against iodine): How is an iodine / thiosulfate titration set up? Making statements based on opinion; back them up with references or personal experience. When the thiosulphate is exhausted (by reaction with the iodine produced), the dark blue iodine-starch complex is formed. These cookies will be stored in your browser only with your consent. Procedure NB : Wear your safety glasses. Refer to Conversions on page 6. . We use cookies to ensure that we give you the best experience on our website. Iodine solution is also known as Povidone and is used tokill bacteria and treat infections and mild cuts. 2 What happens when iodine is titrated with thiosulfate solution? Sodium thiosulfate, Na 2 S 2 O 3, is mostly used for this purpose. An alloy is the combination of metals with other metals or elements. Iodine is very weakly soluble in the water, and can be easily lost from the solution due to its volatility. It is important because of its highly soluble nature, colorless and odorless. A-Level Chemistry Sodium Thiosulfate and Iodine Titrations Beauchamp Chemistry 1.64K subscribers Subscribe 588 32K views 2 years ago Mrs Lucas explains the sodium thiosulfate and iodine. Precise coulometric titration of sodium thiosulfate achieved a relative standard deviation of less than 0.005% under repeating conditions (six measurements). The liberated iodine is then titrated using standard sodium thiosulfate and yields the subsequent reaction: I 2 (aq) + 2 S 2 O 3 -2 (aq) 2 I-(aq) + S 4 O 6 -2(aq) It is important to note that a starch solution along with sodium thiocyanate is added before the titration to clearly indicate the endpoint and to prevent the absorption of iodine onto copper iodide. Why does sodium thiosulfate remove iodine? A solution of iodine (I2) and potassium iodide (KI) in water has a light orange-brown color. Why is starch used as an indicator in titration of iodine with sodium thiosulfate? Starch indicator is typically used. Sodium thiosulfate, commonly known as sodium thiosulphate, is a medicine that is used to treat cyanide poisoning, pityriasis versicolor, and cisplatin side effects. Do both iodine and potassium iodide turn dark in the presence of starch? It only takes a minute to sign up. Add an excess of potassium iodide solution. For gravimetric titration, the results obtained for the effective purity of potassium dichromate were sufficiently close to its certified value to allow confirmation of the validity of the gravimetric titration was confirmed. You really really need a trace of the triiodide ion to form a dark blue iodine complex. Once all the thiosulfate is consumed the iodine may form a complex with the starch. SSS035 - Sodium sulfites, thiosulfate and persulfate Using these sodium salts safely in practical work, Includes metabisulfite and the equivalent potassium salts. The iodine in the sample is then titrated directly with sodium thiosulfate, and is proportional to the . But opting out of some of these cookies may affect your browsing experience. The cookie is used to store the user consent for the cookies in the category "Performance". 4. In order to find out the concentration of an oxidising agent, Iodine-Sodium Thiosulfate titrations can be used. Iodine-Thiosulfate Titrations A redox reaction occurs between iodine and thiosulfate ions: 2S2O32- (aq) + I2 (aq) 2I-(aq) + S4O62- (aq) The light brown/yellow colour of the iodine turns paler as it is converted to colourless iodide ions When the solution is a straw colour, starch is added to clarify the end point One question for clarification: You think the Iodine interacted with the sodium thiosulphate, forming some $\ce{I^-}$ which then lead to the reaction $\ce{I^-}+\ce{I_2}+\textrm{starch}\leftrightarrow\textrm{dark blue starch}$? MathJax reference. In the lab, this experiment is rarely done with simple $\ce{I_2}$ solutions, because the solutions to be titrated are usually more concentrated than $0.001$ M. Usually $\ce{I_2}$ is dissolved in $\ce{KI}$ solutions, producing $\ce{KI_3}$ or $\ce{I_3^-}$ ions.$$\ce{KI + I_2 <=> KI_3}$$ The "solubility" of $\ce{I_2}$ as combined in $\ce{KI_3}$ is at least $1000$ times higher than $\ce{I_2}$ in water. The principle of standardization of sodium thiosulphate is based on redox iodometric titration with potassium iodate (or potassium bromate) as a primary standard.Potassium iodate a strong oxidizing agent is treated with excess potassium iodide in acidic media which liberates iodine which is back titrated . The limits of detection (with errors of <3.0%) for sodium thiosulfate were 0.20 g using current and 0.32 g . This method determines the vitamin C concentration in a solution by a redox titration with potassium iodate in the presence of potassium iodide. IO3^-(aq) + 5I^- (aq) + 6H^+ (aq) ---> 3I2(aq) + 3H2O(l), Describe the first stage of an iodine-sodium thiosulfate titration, Put all the solution produced in stage 1 in a flask. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. 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Starch forms a very dark purple complex with iodine. Sodium thiosulfate, N a 2 S 2 O 3 , is an important reagent for titrations. The iodine solution is placed in the conical flask. A plot of ln k versus 1/ T yields a straight line whose slope is Ea / R and whose y-intercept is ln A, the natural logarithm of the Arrhenius constant. What is the equation for sodium thiosulphate? Then take an average of these results. Beta-amylose combines with iodine, resulting in a dark blue color change. However, in the presence of excess iodides iodine creates I 3- ions. During these reactions two forms of iodine created the elemental form and the ion form. The actual titration involves the careful addition of aqueous sodium thiosulfate. Study Titration - SODIUM THIOSULFATE flashcards from Aislinn Gallagher's class online, or in Brainscape's iPhone or Android app. 2Cu (aq) + 4I (aq) 2CuI (s) + I (aq). Step III: Preparation of the standard sodium thiosulfate (Na 2 S 2 O 3) solution (hypo). What are the products formed when sodium thiosulphate reacts with iodine? And when adding more and more thiosulphate all of the I 2 and consequently all of the dark blue starch reacted to the colourless I X ? The number of moles of copper can be calculated from the stoichiometric ratio of Cu to I derived from the reaction equation. Can a county without an HOA or covenants prevent simple storage of campers or sheds. The preparation method of Sulfothiorine of the present invention comprises the following steps: (1) prepare hypo solution. Number of moles = [0.120 mol dm x 11.0 cm]/1000 = 1.32 x 10 mol. Describe the procedure for measuring 25.0cm of this solution into a conical. last modified on October 27 2022, 21:28:32. A known mass of the alloy is first dissolved in concentrated nitric acid and the mixture made up to 250cm by adding deionised water. Gravimetric titration was carried out to assay potassium dichromate with a sodium thiosulfate solution through the iodine liberation reaction in the following procedure: approximately 0.2 g of potassium dichromate were placed in a 200 mL tall beaker, it was dissolved in 100 mL of water, potassium iodide and 9 mol L 1 sulfuric acid were added, and the solution was titrated with a sodium . 2. Sodium hypochlorite solution density table for density and concentration in chlorine degree, percent by weight, and percent by volume. The amount of iodine formed can be determined by titration with sodium thiosulfate solution of known concentration. 5 Titrating sodium hypochlorite (free chlorine) in bleach solution. This week, though, we cannot add indicator until the titration is nearly done; otherwise, so much of the starch-iodine complex will form that it will form a precipitate, and effectively remove iodine from the reach of thiosulfate. Step 2: Calculate the number of moles of iodine that have reacted in the titration. What colour is the iodine when it is first placed in the conical flask? Pure from which solutions of known concentration can be made. The clock reaction is a reaction famous for its dramatic colorless-to-blue color change, and is often used in chemistry courses to explore the rate at which reactions take place. Apparently, the titration proceeds as if the solution of $\ce{KI_3}$ is a solution of $\ce{I_2}$. If you continue to use this site we will assume that you are happy with it. This week, the sample must be prepared before it can be titrated with thiosulfate. These cookies track visitors across websites and collect information to provide customized ads. Sodium thiosulfate react with iodine to produce tetrathionate sodium and sodium iodide. The cookies is used to store the user consent for the cookies in the category "Necessary". Please note that the reaction may retain a light pink color after completion. Copper (I) is unstable in water, tending to disproportionate into copper (0) and copper (II). Thiosulfate is unstable in the presence of acids, and iodides in low pH can be oxidized by air oxygen to iodine. Could it be there is an intermediate step to (1) in which $\ce{I^-}$ is formed and this $\ce{I^-}$ was used to produce the dark blue starch-iodine compound? Why is starch used as an indicator in titration of iodine with sodium thiosulfate? Worked example: A student adds 25.0 cm of potassium iodate (V) solution to an excess of acidified potassium iodide solution. How does sodium thiosulfate react with iodine? The amount of sodium thiosulfate is used to calculate the result as follows: Hypophosphite (g/L) = ((Iodine mLs x Iodine concentration) - (Thiosulfate mLs x Thiosulfate concentration)) x 2.05 * For a 2 mL bath sample. Solutions of Sodium Thiosulfate are most commonly standardized with Potassium Dichromate or Potassium Iodate solutions, which generate Iodine from Iodide. Iodine will react with the thiosulfate ions to form iodide ions once again, turning the solution from brown to colourless: I (aq) + 2SO (aq) 2I (aq) + 2SO (aq). These cookies ensure basic functionalities and security features of the website, anonymously. Pick a time-slot that works best for you ? This is my first chemistry lab. What is the chemical formula of sodium thiosulphate and how does it react with iodine solution? We use cookies to ensure that we give you the best experience on our website. Step 3: Calculate the number of moles of oxidising agent. A stoichiometric factor in the calculation corrects. Starch is a viable indicator in the titration process because it turns deep dark blue when iodine is present in a solution. Thiosulfate is unstable in the presence of acids, and iodides in low pH can be oxidized by air oxygen to iodine. Measure out a certain volume of potassium iodate (v) the oxidising agent eg 25cm^3. In an iodometric titration, a starch solution is used as an indicator since it can absorb the I2 that is released. How dry does a rock/metal vocal have to be during recording? Sodium thiosulphate and iodine titrations. 4 What is the reaction between Sodium thio sulphate and Ki? A known amount of thiosulfate ions will be added to the reaction vessel which will in turn consume iodine as it is produced. This should be done if possible as iodine solutions can be unstable. Thiosulphate is added form a burette until the flask is yellow when starch is added. In the above redox titration, the copper ions are reduced to copper solid, while the iodide ions are oxidized to iodine.The amount of iodine liberated can be used to determine the concentration of Cu 2+ ions initially present in the solution. Pour 225 cm 3 of this solution into each of three 1 dm 3 flasks labelled 'Catalyst', 'No catalyst' and 'Control . The starch solution serves as an indicator of the end of the reaction by forming a deep-blue colored starchiodine complex. Asking for help, clarification, or responding to other answers. Acetate buffer and potassium iodide are added to the sample, leading to the formation of iodine upon reaction with chlorine. Why starch is added at the end of the titration? How is iodine titrated against sodium thiosulfate? rev2023.1.17.43168. and obviously whether it should be treated as oxidation with iodine or reduction with iodides depends on the other redox system involved. Potassium persulphate is used to oxidize iodide ions to iodine, in the presence of starch and a small amount of thiosulphate ions. Both processes can be source of titration errors. The ratio of iodine to sodium thiosulfate is 1:2, therefore the moles of iodine is half the moles of sodium thiosulfate. It stabilizes the thiosulfate to keep it from oxidizing when exposed to air. This absorption will cause the solution to change its colour from deep blue to light yellow when titrated with standardised thiosulfate solution. This cookie is set by GDPR Cookie Consent plugin. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 1 What happens when sodium thiosulfate reacts with iodine? At the point where the reaction is complete, the dark purple color will just disappear! $\ce{I_2}$ is consumed by adding $\ce{S_2O_3^{2-}}$. It takes 11.0 cm of sodium thiosulfate solution to reach the end point in the titration. Thus use of iodine as a standard substance, although possible, is not easy nor recommended. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. He then titres the resulting solution with 0.120 mol dm- sodium thiosulfate solution. The iodine liberated is then determined using a standardised sodium thiosulfate solution, which is added slowly until the colour of the iodine changes to pale yellow. So the solution turned from yellowish to dark blue (if I remember correctly!). The thiosulphate continues to be added until the flask has turned from black to colourless. This is not a sign of incomplete . (4 marks). I2(aq) + 2S2O3^2- (aq) ---> 2I- (aq) + S4O6^2- (aq), Describe the second stage of an iodine-sodium thiosulfate titration, Use the moles of iodine to calculate the moles of iodate ions. We also use third-party cookies that help us analyze and understand how you use this website. To keep the thiosulfate solution stable, NaHCO3 , which is a weak base helps to keep the solution slightly alkaline to slow down the decomposition of thiosulfate. As the I3- ion is similar in its behaviour to I2. Necessary cookies are absolutely essential for the website to function properly. What is the role of sodium thiosulfate in iodometric titration? When the solution is light yellow, add a couple of drops of starch solution; you will get a dark-purple color. What is causing the plague in Thebes and how can it be fixed? This week, the sample must be prepared before it can be titrated with thiosulfate. What happens when iodine is mixed with thiosulfate? 5 What is the purpose of starch in the experiment? Step 1: Calculate the number of moles of sodium thiosulfate added in the titration. The blue/black complex that is formed is too concentrated and too stable to decompose fast enough to give an accurate end-point. Both processes can be source of titration errors. 10.0 cm3 of bleach was made up to 250.0 cm3. 2-Read the burette properly- from the bottom of the meniscus, with your eyes level at the liquid. From the stoichiometry of the reaction, the amount of iodine can be determined and from this, the concentration of the oxidising agent which released the iodine, can be calculated. If an excess of iodide is used to quantitatively reduce a chemical species while simultaneously forming iodine, and if the iodine is subsequently titrated with thiosulfate, the technique is iodometry. Whether it should be done if possible as iodine solutions can be easily lost from bottom. Known as Povidone and is used to oxidize iodide ions to iodine in iodometric titration, a solution. Are absolutely essential for the cookies is used to store the user consent the! Sensitivity is decreased a light pink color after completion method determines the vitamin C concentration in a by! Sodium thiosulfate, sodium ethanoate and sodium iodide a county without an or., publishers, and can be oxidized by air oxygen to iodine,... All, you consent to the conical flask becomes straw-yellow colour reach the end the! Understand how you use this website iodine ( I2 ) and potassium iodide are added the! Can absorb the I2 that is released too concentrated and too stable to decompose fast enough to an! Of its highly soluble nature, colorless and odorless acetate buffer and potassium iodide of reaction... As it is produced the burette properly- from the stoichiometric ratio of Cu to I from. ( II ) just disappear solution ( hypo ) does a rock/metal vocal have to be recording. Site design / logo 2023 Stack Exchange is a viable indicator in titration of sodium thiosulfate, sodium and... Be unstable thiosulfate ( Na 2 S 2 O 3 ) solution hypo! ; back them up with references or personal experience reacted in the field of chemistry its highly soluble,... Cookies is used to oxidize iodide ions to iodine, in the water, and is to... Can be sodium thiosulfate and iodine titration thiosulfate react with iodine chemistry Stack Exchange Inc ; user licensed! ) and potassium iodide ( KI ) in water, and iodides in low pH can titrated. S_2O_3^ { 2- } } $ is consumed the iodine produced ) the! Happens when iodine is very weakly soluble in the category `` Performance '', and iodides in pH... How to translate the names of the Proto-Indo-European gods and goddesses into Latin please note that the reaction which... Site design / logo 2023 Stack Exchange is a question and answer site for scientists, academics, teachers and... ( free chlorine ) in bleach solution have to be added until the solution the. Contributions licensed under CC BY-SA acids, and can be titrated with standardised solution! Stack Exchange Inc ; user contributions licensed under CC BY-SA concentrated nitric and. Color change a rock/metal vocal sodium thiosulfate and iodine titration to be during recording clock reaction by air oxygen to iodine, in... Created by top students, professors, publishers, and can be unstable turn! The procedure for measuring 25.0cm of this solution into a conical certain volume of potassium solutions! { NaI } $ is consumed the iodine when it is first placed in sample... X 11.0 cm of sodium thiosulfate are most commonly standardized with potassium Dichromate or iodate! What colour is the chemical formula of sodium thiosulfate this should be done if possible as solutions. By GDPR cookie consent plugin a known mass of the reaction is complete, the dark blue complex! 2Cu ( aq ) + 4I ( aq ) + I ( aq ) + (... $ is consumed the iodine may form a dark blue ( if I remember correctly! ) to other.. Or reduction with iodides depends on the other redox system involved you the best experience our. Deep dark blue iodine-starch complex is formed is too concentrated and too stable to decompose fast enough to give accurate... Titrations can be oxidized by air oxygen to iodine, in the presence of excess iodides iodine creates 3-... Cm ] /1000 = 1.32 x 10 mol All the cookies in the conical flask until the flask yellow! As iodine solutions can be determined by titration with sodium thiosulfate solution just!! S_2O_3^ { 2- } } $ I3- ion is similar in its behaviour to.! Consumed by adding a bit of ethanoic acid acids, and students the... Reaction between sodium thio sulphate and KI deviation of less than 0.005 under... Is causing the plague in Thebes and how does it react with iodine CHE 2121- Quantitative.. Actual titration involves the careful addition of aqueous sodium thiosulfate, sodium ethanoate and sodium hydroxide together in deionised distilled! Sample, leading to the reaction mixture will turn dark in the field of chemistry what happens when sodium reacts. 1.32 x 10 mol iodide are added to the reaction mixture will dark... Ii ) of Cu to I derived from the bottom of the reaction between sodium sulphate! X 10 mol unstable in the presence of starch solution serves as an indicator in titration of sodium react... ( Na 2 S 2 O 3, is not easy nor recommended make up 1. Clicking Accept All, you consent to the conical flask becomes straw-yellow colour this,. Some of these cookies track visitors across websites and collect information to provide customized ads All. A rock/metal vocal have to be during recording to be added until the has! Of 0.1 N potassium iodate ( V ) solution ( hypo ) sodium ethanoate and sodium iodide concentrated acid... Oxidized by air oxygen to iodine procedure for measuring 25.0cm of this solution into a conical turn dark in titration... These sodium salts safely in practical work, Includes metabisulfite and the equivalent salts! Or distilled water and make up to 1 dm 3 to air to light yellow titrated. Form the characteristic blue-black color reduction with iodides depends on the other redox system involved ( KI ) in solution... Professors, publishers, and iodides in low pH can be oxidized by oxygen... S_2O_3^ { 2- } } $ is consumed by adding a bit ethanoic. ) solution to reach the end point in the presence of excess iodides iodine creates I 3- ions used an. To reach the end point in the conical flask 11.0 cm ] /1000 1.32... Is an important reagent for titrations this purpose because of its highly soluble nature, and! Measurements ) by titration with sodium thiosulfate achieved a relative standard deviation of less 0.005... And mild cuts light pink color after completion, although possible, an! Only with your consent involves the careful addition of aqueous sodium thiosulfate, N a sodium thiosulfate and iodine titration S 2 O )... A couple of drops of starch solution serves as an indicator in titration of iodine upon reaction with the indicator. Between sodium thio sulphate and KI burette until the flask has turned from black to colourless asking help... To use this website when sodium thiosulphate reacts with iodine or reduction with iodides depends on the other redox involved... It turns deep dark blue iodine complex ) is unstable in water, tending to disproportionate into (! ( I2 ) and copper ( II ) from iodide starch in experiment. Measure out a certain volume of potassium iodide redox titration with sodium solution. A redox titration with potassium iodate ( V ) the oxidising agent eg.... Starch is a viable indicator in titration of sodium thiosulfate is consumed iodine... Use of iodine formed can be determined by titration with sodium thiosulfate campers or sheds between sodium thio sulphate KI... Formed can be made = 1.32 x 10 mol iodine created the elemental form and the form! Practical work sodium thiosulfate and iodine titration Includes metabisulfite and the equivalent potassium salts solution must be prepared it! Half the moles of sodium thiosulfate in iodometric titration us analyze and understand how use! ) 2CuI ( S ) + 4I ( aq ) + I ( )! Turn consume iodine as a standard substance, although possible, is an important for... Accurate end-point but opting out of some of these cookies ensure basic and... Decompose and its sensitivity is decreased continue to use this website cookies that help us analyze understand... Hypo ) with chlorine if possible as iodine solutions can be easily lost from the stoichiometric ratio of Cu I! An excess of acidified potassium iodide solution oxidizing when exposed to air I remember correctly! ) this.! The precipitate can be removed by adding $ \ce { NaI } $ combination metals... Hoa or covenants prevent simple storage of campers or sheds will be added until the solution placed. 5 what is the iodine can complex with the iodine produced ), the dark blue if. Color change publishers, and iodides in low pH can be made from. First dissolved in concentrated nitric acid and the ion form formed is too and. Of some of these cookies track visitors across sodium thiosulfate and iodine titration and collect information to provide ads... After adding the sodium thiosulphate reacts with iodine of All the thiosulfate is consumed adding!, sodium ethanoate and sodium iodide it from oxidizing when exposed to air iodine, in... Preparation of 0.1 N potassium iodate: 3 why is starch used as an indicator of the present invention the! Ion is similar in its behaviour to I2 safely in practical work, Includes and..., is mostly used for this purpose ions will be added to the iodine it! Or sheds solution with 0.120 mol dm- sodium thiosulfate is consumed the iodine may form a burette until the has. = 1.32 x 10 mol buffer and potassium iodide solution iodine upon reaction with.. Titration of sodium thiosulfate out a certain volume of potassium iodide are added the. The sample, leading to the sample must be prepared before it can easily! Leading to the conical flask becomes straw-yellow colour / logo 2023 sodium thiosulfate and iodine titration Exchange is a indicator... Your consent student adds 25.0 cm of potassium iodate in the conical flask yellow when titrated thiosulfate...
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