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Solution: Will Ca(OH)2 precipitate from solution if the pH of a 6.0×10−2 M solution of CaCl2 is adjusted to 8.0?

Problem

Will Ca(OH)2 precipitate from solution if the pH of a 6.0×10−2 M solution of CaCl2 is adjusted to 8.0?

Solution

We are being asked to determine if Ca(OH)2 will precipitate from 6.0×10−2 M solution of CaCl2 when the pH is adjusted to pH 8.0.


We are dealing with a Ksp problem that has a common ion effect

Common ion effect is the effect of the addition of common ions to the equilibrium of a solution.


To solve this problem, we will use the reaction quotient.

The reaction quotient, Q, is used to determine if our chemical reaction is at equilibrium.


Depending on if Q is greater than or less than K our reaction will shift to attain equilibrium by reaching the equilibrium constant K. 

The direction our reaction shifts determines whether our reactants or products are increasing or decreasing.

If K = Q, the reaction is. at equilibrium.

If K>Q, the reaction shifts in the forward direction to reach equilibrium.

If K<Q, the reaction shifts in the reverse direction to reach equilibrium.


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