Sulfate Ions (Oxford AQA IGCSE Chemistry) : Revision Note
Discover the sulfate ion test for IGCSE Chemistry. This page explains how to identify sulfate ions through practical steps and observations.
Test for Sulfate Ions
Acidify the sample with dilute hydrochloric acid and then add a few drops of barium chloride solution
If a sulfate is present then a white precipitate of barium sulfate is formed:
Ba2+ (aq) + SO42- (aq) → BaSO4 (s)
The test can also be carried out with barium nitrate solution
Testing for sulfate ions

Examiner Tips and Tricks
HCl is added first to remove any carbonates which may be present which would also produce a precipitate and interfere with the results.
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