2.20 describe the laboratory preparation of carbon dioxide from calcium carbonate and dilute hydrochloric acid

  • Calcium carbonate + hydrochloric acid –> calcium chloride + water + carbonate
  • 2CaCo3 + 2HCl –> Co2 + CaO2 + H2O
  1. Calcium carbonate (in the form of marble chips) are added to the conical flask with hydrochloric acid
  2. HCl reacts with the CaCO3, producing calcium chloride, water and carbon dioxide
  3. Gas can be collected in a syringe and tested for carbon dioxide, by turning limewater milky 

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