Learning objective
Identify carbonate, sulfate and halide ions using appropriate tests.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Reactions of ions in aqueous solution (A-level only)
Subtopic
Aqueous ion tests (A-level only)
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Quick explanation
Identify carbonate, sulfate and halide ions using appropriate tests
- This point belongs to Reactions of ions in aqueous solution (A-level only), especially Aqueous ion tests (A-level only).
- You need to be able to identify carbonate, sulfate and halide ions using appropriate tests.
- The key ideas to know are sulfate, halide, and carbonate.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Aqueous ion tests (A-level only) to exam-style questions, flashcards, and revision notes for Reactions of ions in aqueous solution (A-level only).
Quick student answer
Which of the following tests can be used to identify the presence of carbonate ions (CO₃²⁻) in a solution?
Direct answer
Add dilute hydrochloric acid and observe effervescence.
Key terms
- Effervescence: The formation of bubbles of gas in a liquid, often observed when an acid reacts with a carbonate.
- Precipitate: An insoluble solid that forms when two solutions are mixed, indicating a chemical reaction.
Common trap
Confusing sulfate and sulfite tests: Barium chloride is used for sulfate ions; sulfite ions require a different test, such as adding hydrochloric acid to produce sulfur dioxide.
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Revision notestopic notes
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Open revision notesRelated learning objectives
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Aqueous ion tests (A-level only)
- Link observations to conclusions in qualitative analysis.
Aqueous ion tests (A-level only)
- Required practical: carry out test-tube reactions to identify cations and anions.
Aqueous ion tests (A-level only)