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) + 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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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:

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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) + 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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