Testing for Carbon Dioxide Gas

Reagent Used

• Lime Water: A colorless liquid used to test for the presence of carbon dioxide gas.

Procedure

1. Objective: To test for carbon dioxide gas using lime water.
2. Method:
   • Produce carbon dioxide gas.
   • Bubble the gas through lime water.
   • Avoid adding lime water to the gas; instead, the gas should bubble through the liquid.

Production of Carbon Dioxide

• Materials:
  • Calcium carbonate
  • Hydrochloric acid
• Reaction:
  • Carbon dioxide is produced from the reaction between calcium carbonate and hydrochloric acid.

Observations

• Vigorous bubbling occurs when carbon dioxide is bubbled through lime water.
• A white precipitate forms, turning the lime water milky.

Conclusion

• The presence of carbon dioxide in lime water results in a milky appearance due to the formation of a white precipitate.