The given reaction equation is the net balanced equation.
2 S2O32-(aq) + I3-(aq) → S4O62-(aq) + 3I-(aq)
During titration, S2O32- reacts with I3-. The amount of I3- in the solution can be determine by the total amount of S2O3- used. We’re going to calculate for the concentration of I3-, using the following steps:
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) + 3I-(aq)
Given that it requires 30.4 mL of 0.470 M Na2S2O3 (aq) to titrate a 25.0-mL sample of I3- (aq), calculate the molarity of I3- (aq) in the solution.
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