November 28, 2021, 07:20:21 AM
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Topic: Calculating Concentrations  (Read 510 times)

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Offline cherrybomb

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Calculating Concentrations
« on: June 16, 2021, 07:53:48 PM »
How would I go about calculating the I- concentration in a solution made up of 20 mL 0.20 M KI, 10 mL 0.0050 M Na2S2O3, and 20 mL 0.10 M K2S2O8?

When I first calculated I divided the mL of KI by the molar mass, so 20/166.0028=.1204 mol. Then I found the liters of solute by adding the mL of the other compounds to get 30 mL /1000=0.03L. Finally I divided .1204/0.03=4.013. However, I feel like this number is too large and I'm unsure where to go from here.

Offline Borek

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Re: Calculating Concentrations
« Reply #1 on: June 17, 2021, 02:41:58 AM »
This is a redox process, you need to use standard potentials and the Nernst equation.
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