The amount of I3- (aq) in a solution can be determined by titration with a solution containing a known concentration of S2O32- (aq) (thiosulfate ion).  The determination is based on the net ionic equation  2S2O32- (aq) + I3- (aq) yields to S4O62- (aq) + 3I- (aq) Given that it requires 34.2 mL of 0.500 M Na2S2O3 (aq) to titrate a 20.0 mL sample of I3- (aq), calculate the molarity of I3- (aq) in the solution.

Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter4: Reactions In Aqueous Solution
Section: Chapter Questions
Problem 53QAP: The molarity of iodine in solution can be determined by titration with arsenious acid, H3AsO4. The...
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The amount of I3(aq) in a solution can be determined by titration with a solution containing a known concentration of S2O32- (aq) (thiosulfate ion).  The determination is based on the net ionic equation 

2S2O32- (aq) + I3- (aq) yields to S4O62- (aq) + 3I- (aq)

Given that it requires 34.2 mL of 0.500 M Na2S2O3 (aq) to titrate a 20.0 mL sample of I3- (aq), calculate the molarity of I3- (aq) in the solution. 

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