How to Prepare Carbon Dioxide Gas

A physical representation of a molecular structure
This is the space-filling molecular structure for carbon dioxide.

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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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Your Citation
Helmenstine, Anne Marie, Ph.D. "How to Prepare Carbon Dioxide Gas." ThoughtCo, Aug. 27, 2020, thoughtco.com/carbon-dioxide-prepcarbon-gas-607544. Helmenstine, Anne Marie, Ph.D. (2020, August 27). How to Prepare Carbon Dioxide Gas. Retrieved from https://www.thoughtco.com/carbon-dioxide-prepcarbon-gas-607544 Helmenstine, Anne Marie, Ph.D. "How to Prepare Carbon Dioxide Gas." ThoughtCo. https://www.thoughtco.com/carbon-dioxide-prepcarbon-gas-607544 (accessed October 26, 2021).