Sulfate Ions (Oxford AQA IGCSE Chemistry)
Revision Note
Author
Alexandra BrennanExpertise
Chemistry
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
Exam Tip
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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