AQA GCSE Chemistry · 8462
Specification 4.8.3.3 · Paper 2
Revise: Test for CarbonatesAdd a few drops of dilute acid, such as dilute hydrochloric acid or dilute nitric acid, and look for effervescence.
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GCSE Chemistry · key term
The formation of visible bubbles as a gas is produced in a liquid.
Used by AQA and Edexcel
Specification 4.8.3.3 · Paper 2
Revise: Test for CarbonatesAdd a few drops of dilute acid, such as dilute hydrochloric acid or dilute nitric acid, and look for effervescence.
Specification 3.11, 4.3 · Paper 1
Visible bubbling caused by gas escaping from a liquid.
When asked for the observation, distinguish the two stages: effervescence occurs in the sample, then limewater turns milky.
Effervescence only shows that a gas is being released. Use the reactants and, if asked, the appropriate gas test to identify it.
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The production of gas bubbles during a reaction.