AQA GCSE Chemistry

Revision Notes

8.3.5 Sulfates

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) + SO42- (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.

Author: Francesca

Fran has taught A level Chemistry in the UK for over 10 years. As head of science, she used her passion for education to drive improvement for staff and students, supporting them to achieve their full potential. Fran has also co-written science textbooks and worked as an examiner for UK exam boards.

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