Problem: 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:2 S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3 I-(aq)Given that it requires 35.8 mL of 0.350 M Na2S2O3(aq) to titrate a 30.0-mL sample of I3-(aq), calculate the molarity of I3-(aq) in the solution.

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Given Reaction: 2 S2O32–(aq) + I3(aq) → S4O62(aq) + 3 I(aq)

Stoichiometry: 2 moles of S2O32 reacts with 1 mole of I3


Given: 35.8 mL of 0.350 M Na2S2O3(aq) and 30.0-mL I3(aq)

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Problem Details

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:

2 S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3 I-(aq)

Given that it requires 35.8 mL of 0.350 M Na2S2O3(aq) to titrate a 30.0-mL sample of I3-(aq), calculate the molarity of I3-(aq) in the solution.

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