# 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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87% (194 ratings)
###### FREE Expert Solution

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:

87% (194 ratings) ###### 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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Our tutors have indicated that to solve this problem you will need to apply the Solution Stoichiometry concept. You can view video lessons to learn Solution Stoichiometry. Or if you need more Solution Stoichiometry practice, you can also practice Solution Stoichiometry practice problems.

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Based on our data, we think this problem is relevant for Professor Bindell's class at UCF.