Explain iodide salt is placed in another beaker

Reference no: EM13333602

In an experiment a 0.00400 mol/L solution of sodium thiosulfate is prepared. 20 grams of regular salt is placed in one beaker and 20 grams of Iodide salt is placed in another beaker. 3.0 grams is KI was placed into each beaker. (bromine water, formate buffer, and starch indicator also added). A titration was preformed using the sodium thiosulfate as titrant. The regular salt required 1.2mL to reach endpoint and the Iodide salt required 6.15 mL. What is the % I^- in both regular salt and iodide salt? The chemical equations are IO3^-+6H^+ +8I^- ->3I3^-+3H2O (after addidtion of KI) I2^-+2S2O3^2- ->3I^-+S4O6^2- (iodized salt solution titrated with sodium thiosulfate solution)

Reference no: EM13333602

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