2CLabManual201303

First you are going to standardize a freshly prepared

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Unformatted text preview: going to standardize a freshly prepared solution of sodium thiosulfate (Na2S2O3). You will do this by reacting iodate (IO3-) with excess iodide (I-) in acidic solution to produce a known quantity of iodine and water. The iodine produced will be titrated with a sodium thiosulfate solution. The products of the reaction between iodine and thiosulfate are the iodide ion and the tetrathionate ion (S4O62-). By using a known amount of iodate and stoichiometric calculations you are able to calculate the exact concentration of the thiosulfate solution you have prepared. In the second part of the experiment you will use your standardized thiosulfate solution to analyze a bleach unknown. Bleach contains sodium hypochlorite (NaClO) that reacts with iodide to produce iodine, chloride ion, and water. The amount of iodine produced can then be determined by titration with your standard sodium thiosulfate. As prelaboratory preparation, you should read sections the Redox sections in your text. Redox reactions...
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