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When \( C a(O H)_{2} \) attains solubility equilibrium, the:

1. solution is saturated
2. \( p H \) will be less than 7
3. trial \( K_{s p} \) is less than the \( K_{s p} \)
4. concentrations of the ions are equal

Correct answer: solution is saturated

Solution

When Ca(OH)2 reaches solubility equilibrium, the rate of dissolving equals the rate of crystallizing, so no more solid can dissolve under those conditions. That means the solution is saturated.

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