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4.2 Reactions of acids

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Question 8

A student reacts magnesium with dilute hydrochloric acid. The student writes this ionic equation for the reaction:

Mg(s)+2H+(aq)→Mg2+(aq)+H2(g)\text{Mg}(s) + 2\text{H}^{+}(aq) \rightarrow \text{Mg}^{2+}(aq) + \text{H}_2(g)Mg(s)+2H+(aq)→Mg2+(aq)+H2​(g)

The student then claims that the equation cannot represent the reaction because it does not include chloride ions.

Explain why the student's claim is wrong.

[2]
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4.2 Reactions of acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Reactions of acids

88 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1a Reactions of acids with metals, 4.2.1b Redox in acid-metal reactions, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5a Titrations, 4.2.5b Calculating quantities in titrations, and 4.2.6 Strong and weak acids. Each one has a worked solution and a mark scheme showing where the marks go.

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