2. Using your grams of H2O2 you calculated in Trial 1, calculate the vomme of Na2 S2O3 expected o be used to reach endpoint. Determine the % of H2O2 using standard Na2 S2O3 Post Lab Trial 1: Volume of Na2 S2O3 used in titration: 13.10 mL %(wt/vol)H2O2:.. 613% 2(0.07240M)(0.01310 L)⋅(34.02)×100% Create a solution of 0.1MNaN2 S2O3 Post Lab Trial 1: mass of KIO3 standard 0.1149 g vol. of Na2 S2O3 used in titration 50.50 mL Molarity of Na2 S2O3O.0636M Calculation: