Why the thiosulfate solution is added to the flask


To determine the solubility productconstant (Ksp) at 50oC forNi(IO3)2, a chemist prepares a saturated solution of the salt at this temperature. They filter and remove a10.00 mL aliquot of this solution, and add 50.0 mL of distilledwater, 2 g of KI and 10 mL of 3 M HCl to the flask. Thiosulfate solution is added to the flask and after 2% starch solution is added it turns blue. The chemist keeps adding thiosulfate solution from the burette until the solution in the flask turns colorless.It takes 1.459x10^1 mL of 5.10x10^-2 MNa2S2O3 to reach the end point ofthe titration.

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Chemistry: Why the thiosulfate solution is added to the flask
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