Question

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

• A. Heated copper oxide
• B. Cold, solid calcium chloride
• C. Cold, solid calcium hydroxide
• D. Heated charcoal

Answer 1

Answer: (C)

Cold, solid calcium hydroxide

Answer 2

$CO_{2}$ is acidic oxide and thus more effectively absorbed by an alkali.