Suppose you standardize a Na2S2O3 solution by dissolving 570 ng of KIO3 in acid and allow it to react with excess KI. The triiodide produced is then titrated with Na2S2O3 solution, requiring 17.00 mL to reach the starch/triiodide end point.

 Determine the molarity of the thiosulfate solution. 

                                                                         IO3 − + 8 I− + 6 H+ → 3 I3 − + 3 H2O I 3 − + 2 S2O3 2− → 3 I− + S4O6 2−