GCSEChemistryAQARevision Notes8. Chemical Analysis8.3 Methods of Identifying Ions8.3.5 Sulfates

Sulfates (AQA GCSE Chemistry)

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Test for Sulfates

Acidify the sample with dilute hydrochloric acid and then add a few drops of aqueous barium chloride
If a sulfate is present then a white precipitate of barium sulfate is formed:

Ba²⁺ (aq) + SO₄^2- (aq) → BaSO₄ (s)

The test can also be carried out with barium nitrate solution

Sulfate Ion Test, IGCSE & GCSE Chemistry revision notes

A white precipitate of barium sulfate is a positive result for the presence of sulfate ions

Exam Tip

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

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Author: Stewart

Stewart has been an enthusiastic GCSE, IGCSE, A Level and IB teacher for more than 30 years in the UK as well as overseas, and has also been an examiner for IB and A Level. As a long-standing Head of Science, Stewart brings a wealth of experience to creating Topic Questions and revision materials for Save My Exams. Stewart specialises in Chemistry, but has also taught Physics and Environmental Systems and Societies.