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In: Civil Engineering

environmental engineering Please explain What will happen to Ca(OH)2 solid when it is placed in a...

environmental engineering

Please explain What will happen to Ca(OH)2 solid when it is placed in a saturated solution of calcium hydroxide.

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Expert Solution

Calcium hydroxide is not readily soluble in the water. But its being among the strong base, the amount of calcium hydroxide that dissolved in the water would dissociate completely to produce calcium cations and hydroxide anions at equilibrium.

Ca(OH)2 Ca2+ (aq) + 2 OH- (aq)

Solubility of the calcium hydroxide in aqueous is about 1.73 g / L . Equivalent mass of Ca(OH)2 is 74.093.

that is 1.73g / 74.093 = 0.02335 mol / L

At ambient temperature, calcium hydroxide dissolves in pure water to produce an alkaline solution with a pH of about 12.4 when saturated. At high pH value its solubility drastically decreases. This is caused due to a phenomenon called Common ion effect. Due to this effect, the electrolyte do not dissolve after reaching the saturation.

After the solution reaching the saturation, if we add few more Ca2+ to the solution, above reaction gets reversed.

Ca 2+ + 2 OH-   Ca(OH)2

This effect will be continued till new equilibrium is attained by the solution. Hence excess calcium hydroxide is get precipitated.

Ally Wells answered 10 months ago
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