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Hard Water

We use a solu...

Question

We use a solution of slaked lime to whitewash the walls. In the beginning the wall looks rough and coarse, but after 2 - 3 days the wall appears smooth and shiny. This is due to the formation of:

A

Calcium hydroxide

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B

Calcium oxide

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C

Calcium chloride

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D

Calcium carbonate

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Solution

The correct option is D
Calcium carbonate

Slaked lime is calcium hydroxide which reacts slowly with the carbon dioxide present in air to form thin and shiny layer of calcium carbonate. The chemical reaction is:
Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H₂O_(l)

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