What Is the Molarity of a Potassium Triiodide Solution,KI₃(aq),if 30

question 39

Multiple Choice

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 S₂O₃^2-(aq) + I₃^-(aq) → S₄O₆^2-(aq) + 3 I^-(aq)

• A)0.0833 mol L^-1
• B)0.120 mol L^-1
• C)0.167 mol L^-1
• D)0.333 mol L^-1

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