The excess i3 was titrated with 50.00 ml of a 0.02000 m, Ask an Expert

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A 1.784 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution. To this solution was added 1.570 grams of KI and 50.00 mL of a 0.00989 M KIO3 solution. The excess I3 was titrated with 50.00 mL of a 0.02000 M Na2S2O3 solution. What was the mass percent of arsenic trichloride in the original sample?

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