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How to Prepare Carbon Dioxide Gas

How to Prepare Carbon Dioxide Gas

These are instructions for preparing carbon dioxide gas (CO2) from calcium carbonate and hydrochloric acid.

Carbon Dioxide Reactants

Only two materials are needed to make carbon dioxide:

  • calcium carbonate (marble chips)
  • 5M hydrochloric acid

Carbon Dioxide Gas Preparation

  1. Add 5M hydrochloric acid to 5g-10g marble chips. Carbon dioxide gas is released by the chemical reaction.
  2. Collect the carbon dioxide from the upward displacement of air in a hood. Carbon dioxide is about 60% denser than air, so it will fill the reaction container.

Chemical Reaction

2HCl + CaCO3 → CO2 + CaCl2 + H2O


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