H2S was measured by slowly adding 25.00 mL of aqueous H2S to 25.00 mL of acidified standard

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H2S was measured by slowly adding 25.00 mL of aqueous H2S to 25.00 mL of acidified standard 0.010 44 M I-3 to precipitate elemental sulfur. (If [H2S] > 0.01 M, then precipitated sulfur traps some I-3 solution, which is not subsequently titrated.) The remaining I-3 was titrated with 14.44 mL of 0.009 336 M Na2S2O3. Find the molarity of the H2S solution. Should starch indicator be added to this titration at the beginning or just before the end point?
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