AQA · Chemistry · 8462
GCSE Chemistry (AQA): Test for Anions
Topic 8 — Chemical Analysis. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Tests for Anions - Carbonate, Sulfate and Halide Ions (2026/27 exams)"; each card deep-links to the moment in the video it came from. Lesson 8.04 of Cognito's AQA GCSE Chemistry (Triple) course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-t_8.04.
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What colour precipitate does silver iodide form?
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Yellow.
Why is dilute hydrochloric acid added before barium chloride in the sulfate test?
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To remove carbonate and sulfite ions, which would also form a white precipitate with barium ions and give a false positive.
Which acid is added to a sample when testing for carbonate ions?
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Dilute hydrochloric acid — it releases carbon dioxide from any carbonate present.
Which solution is added in the second step of the test for sulfate ions?
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Barium chloride solution, which supplies the barium ions.
Define an anion.
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A negatively charged ion.
Which acid is used in the first step of the halide ion test?
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Dilute nitric acid, to remove carbonate and sulfite impurities.
What colour precipitate does silver chloride form?
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White.
What is the positive result when carbon dioxide is bubbled through limewater?
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The limewater turns cloudy.
What colour precipitate does silver bromide form?
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Cream.
Which solution is added in the second step of the halide ion test?
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Silver nitrate solution — hence the name 'silver nitrate test'.
Sulfate ions react with barium ions to form barium sulfate, a ? precipitate.
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white
What three products form when a carbonate reacts with an acid?
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A salt, carbon dioxide gas and water.
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