Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which of the following is the best absorbing material for the carbon dioxide?

Heated copper oxide

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Cold, solid calcium chloride

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Cold, solid calcium hydroxide

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Heated charcoal

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Solution

The correct option is C
Cold, solid calcium hydroxide

Calcium hydroxide readily absorbs $C O_{2}$ and forms $C a C O_{3}$ .

$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

$C O_{2}$ is an acidic oxide and thus it is effectively absorbed by a base like slaked lime $[C a (O H)_{2}]$ .

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