Carbon Dioxide - How to Prepare Carbon Dioxide Gas

Gas Preparation Instructions

This is the space-filling molecular structure for carbon dioxide.
This is the space-filling molecular structure for carbon dioxide. INDIGO MOLECULAR IMAGES LTD / Getty Images

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)
  • 5 M hydrochloric acid

Carbon Dioxide Gas Preparation

  1. Add 5 M hydrochloric acid to 5 - 10 g 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% more dense than air, so it will fill the reaction container.

    Chemical Reaction

    2HCl + CaCO3 → CO2 + CaCl2 + H2O

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    Helmenstine, Anne Marie, Ph.D. "Carbon Dioxide - How to Prepare Carbon Dioxide Gas." ThoughtCo, Sep. 13, 2017, thoughtco.com/carbon-dioxide-prepcarbon-gas-607544. Helmenstine, Anne Marie, Ph.D. (2017, September 13). Carbon Dioxide - How to Prepare Carbon Dioxide Gas. Retrieved from https://www.thoughtco.com/carbon-dioxide-prepcarbon-gas-607544 Helmenstine, Anne Marie, Ph.D. "Carbon Dioxide - How to Prepare Carbon Dioxide Gas." ThoughtCo. https://www.thoughtco.com/carbon-dioxide-prepcarbon-gas-607544 (accessed November 21, 2017).