Question

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 M thiosulfate solution, K2S2O3(aq)? The chemical equation for the reaction is
2 S2O32-(aq) + I3-(aq) -> S4O62-(aq) + 3 I-(aq).
A) 0.0833 M
B) 0.120 M
C) 0.167 M
D) 0.333 M

Answer

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