Equilibria Involving Carbon Dioxide and their Effect on the Acidity of Soda Water

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In this classic demonstration, from the Royal Society of Chemistry, soda water containing indicator is placed in a syringe. With one end sealed, the pressure is reduced by pulling back on the syringe. The carbon dioxide is seen outgassing from the soda water and the solution becomes less acidic.

The resource provides a list of apparatus and chemicals needed for the experiment, together with teaching tips.

Curriculum links include: solubility of gasses, equilibria, Le Chatelier’s principle.

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