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Assume that you mixed 20.00 mL of 0.040 M KI with 20.00 mL of 0.060 M (NH4)2S2O8

Assume that you mixed 20.00 mL of 0.040 M KI with 20.00 mL of 0.060 M (NH4)2S2O8 , 10.00 mL of 0.00070M Na2S2O3 , and a few drops of starch. The point of mixing sets time = 0. Calculate the % of the initial (NH4)2S2O8 that has reacted when the blue color appears.(don't know how to approach the answer)

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