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What is the molarity of a potassium triiodide solution,KI3(aq) ,if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.200 mol L-1 thiosulfate solution,K2S2O3(aq) ? The chemical equation for the reaction is
2 S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3 I-(aq)
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