Problem: Potassium hydroxide is used to precipitate each of the cations from their respective solutions. Determine the minimum concentration of KOH required for precipitation to begin in each case.1.8×10−3 M MgBr2

FREE Expert Solution

We’re being asked to determine the minimum concentration of KOH needed to precipitate 1.8 x 10-3 M MgBr.


To solve this problem, we need to:

Step 1. Write the balanced equation for this reaction and the expected precipitate.
Step 2. Determine the dissociation of the expected precipitate and the concentration of Mg2+

Step 3. Calculate for the concentration of OH- using Ksp 
Step 4. Determine the concentration required for the precipitate to form

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Problem Details

Potassium hydroxide is used to precipitate each of the cations from their respective solutions. Determine the minimum concentration of KOH required for precipitation to begin in each case.

1.8×10−3 M MgBr2

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Selective Precipitation concept. If you need more Selective Precipitation practice, you can also practice Selective Precipitation practice problems.