Calculate the molar concentration of a thiosulfate solution from the following information:
A 30.00-mL aliquot of a 0.0254 M KIO3 solution is added to a flask containing 2 g of KI and 10 mL of 0.5 M H2SO4. The resulting solution is titrated to a starch endpoint with 20.77 mL of the thiosulfate solution.