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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: cherrybomb on June 16, 2021, 07:53:48 PM

Title: Calculating Concentrations
Post by: cherrybomb 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.

Title: Re: Calculating Concentrations
Post by: Borek on June 17, 2021, 02:41:58 AM

This is a redox process, you need to use standard potentials and the Nernst equation.