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)
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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