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GCSE Chemistry · key term
An ion with the formula , found in carbonate compounds.
Used by AQA and Edexcel
Specification 4.8.3.3 · Paper 2
Revise: Test for CarbonatesTo test an unknown sample for carbonate ions, add a dilute acid. If carbonate ions are present, the mixture effervesces because carbon dioxide gas is produced.
Specification 9.5C · Paper 2
An ion with the formula . It produces carbon dioxide when treated with dilute acid.
Revise: Tests for AnionsThis identifies the gas as carbon dioxide and therefore shows that carbonate ions were present.
In an ionic equation, check both atoms and charge: the carbonate ion requires two hydrogen ions.
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