An unknown concentration of sodium thiosulfate, Na2S2O3,Na2S2O3, is used to titrate a standardized solution of KIO3KIO3 with excess KIKI present. Suppose 16.05 mL16.05 mL of the Na2S2O3Na2S2O3 solution is required to titrate the iodine formed from 21.60 mL21.60 mL of 0.0115 M KIO3.0.0115 M KIO3. What is the molarity of the Na2S2O3Na2S2O3 solution?

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