Learning objective
Required practical: carry out test-tube reactions to identify cations and anions.
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
Required practical: carry out test-tube reactions to identify cations and anions
- 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 required practical: carry out test-tube reactions to identify cations and anions.
- The key ideas to know are reactions, practical, and required.
- 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 ions can be identified by adding dilute hydrochloric acid followed by barium chloride solution?
Direct answer
SO₄²⁻
Key terms
- Precipitate: A solid that forms and settles out of a liquid mixture during a chemical reaction.
- Aqueous solution: A solution in which water is the solvent.
Common trap
Misidentifying ions: Remember that sulfate ions produce a white precipitate with barium chloride, while carbonate ions produce carbon dioxide with dilute acid.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Describe reactions of aqueous metal ions with sodium hydroxide.
Aqueous ion tests (A-level only)
- Describe reactions of aqueous metal ions with ammonia.
Aqueous ion tests (A-level only)
- Identify carbonate, sulfate and halide ions using appropriate tests.
Aqueous ion tests (A-level only)
- Link observations to conclusions in qualitative analysis.
Aqueous ion tests (A-level only)