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GCSE Chemistry · key term
A negatively charged ion with the formula .
Used by AQA and Edexcel
Specification 4.8.3.5 · Paper 2
Revise: Test for SulfatesFor sulfate ions, the positive result is the formation of a white precipitate when barium chloride solution is added in the presence of dilute hydrochloric acid.
Specification 9.5C · Paper 2
An ion with the formula . It forms a white precipitate with barium ions in an acidified solution.
Revise: Tests for AnionsDo not use sulfuric acid: it would introduce sulfate ions and could itself produce the positive result.
Name both the reagent and the positive observation: for example, “add dilute hydrochloric acid, then barium chloride solution; a white precipitate shows sulfate ions”.
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