AQA · Chemistry · 8462
GCSE Chemistry: Sulfates
Chemical analysis · AQA GCSE Chemistry (8462), specification point 4.8.3.5. Cards are generated from the exam board's own specification for "Sulfates", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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Which reagent is used to test for sulfate ions in solution?
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Barium chloride solution, added in the presence of dilute hydrochloric acid.
What is observed when barium chloride solution is added to a solution containing sulfate ions?
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A white precipitate forms.
Which acid is added alongside barium chloride in the test for sulfate ions?
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Dilute hydrochloric acid.
Why is dilute hydrochloric acid added before barium chloride in the sulfate test?
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To remove any carbonate ions, which would otherwise also give a white precipitate (barium carbonate) and cause a false positive.
What is the white precipitate formed in the barium chloride test for sulfates?
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Barium sulfate (BaSO₄), which is insoluble in water.
Sulfate ions in solution produce a ? precipitate with barium chloride solution in the presence of dilute hydrochloric acid.
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white
An unknown solution gives a white precipitate with acidified barium chloride solution. Which ion is present?
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Sulfate ions (SO₄²⁻).
What is the aim of AQA GCSE Chemistry required practical 7?
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To use chemical tests to identify the ions in unknown single ionic compounds.
Which ion tests are covered in AQA GCSE Chemistry required practical 7?
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All the tests from flame tests through to the sulfate test (spec sections 4.8.3.1–4.8.3.5).
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