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Test for carbon dioxide using limewater

Chemical analysis • Identification of common gases

Key concepts

What you'll likely be quizzed about

  • Carbon dioxide (CO2) is a colorless, odorless gas.
  • It is slightly soluble in water and reacts with basic solutions to form carbonate ions.

Flashcards

Test your knowledge with interactive flashcards

Why clear, fresh limewater is important

Click to reveal answer

Using clear, fresh limewater prevents confusion with pre-existing turbidity that could falsely indicate a positive result.

Key notes

Important points to keep in mind

Limewater is a Ca(OH)2 solution that turns cloudy when CO2 is present due to CaCO3 formation.

Cloudiness indicates CO2; prolonged bubbling can clear the cloudiness by forming Ca(HCO3)2.

Low CO2 concentration may not produce visible cloudiness; interpret negative results cautiously.

Other acidic gases or impurities can cause turbidity; confirmatory tests may be necessary.

Use fresh, clear limewater and bubble gas through a delivery tube for reliable results.

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