Physical Chemistry : Equilibrium in Solution

Study concepts, example questions & explanations for Physical Chemistry

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Example Questions

Example Question #1 : Equilibrium In Solution

 

A saturated aqueous solution of calcium hydroxide is prepared. Given the information above, how will adding  of  affect the solubility and the  of the solution?

Possible Answers:

The solubility will increase; the  will increase

The solubility will remain unchanged; the  will remain unchanged

The solubility will decrease; the  will decrease

The solubility will decrease; the  will remain unchanged.

The solubility will increase; the  will remain unchanged

Correct answer:

The solubility will decrease; the  will remain unchanged.

Explanation:

Adding  contributes  ions into the solution, driving the reaction to the left, and decreasing the solubility of the calcium hydroxide. This is known as the common-ion effect. The  remains unchanged. This is due to the fact that only a change in temperature can bring about a change in an equilibrium constant. 

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