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Sulfate ion precipitation test
Sulfuric acid contains sulfate ions.
Describe the test for the presence of sulfate ions in sulfuric acid. Give the result of the test.
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Marking points
- 1 Adds barium chloride solution or barium nitrate solution.
- 2 States that a white precipitate forms, paired with the accepted test.
Full-mark answer
Add barium chloride solution. A white precipitate forms if sulfate ions are present.
Why this answer loses marks
Add silver nitrate and look for a white precipitate.
Silver nitrate is used for halide testing; sulfate ions require a soluble barium reagent.