How can CO2 gas be detected?

When you heat up Copper(II) Carbonate and you produce Carbon Dioxide gas, what is the method used to test the presence of Carbon Dioxide gas?

Bubble the gas through "lime water" (a solution of saturated with calcium hydroxide). If there is carbon dioxide present, the solution will become milky because the following precipitation reaction will occur:

Ca(OH)2(aq) + CO2(g) CaCO3(s) + H2O(l)

The test easily detects carbon dioxide in breath.

Author: Fred Senese

General Chemistry Online! How can CO_2_ gas be detected?

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