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10.1 Qualitative analysis: tests for ions

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Question 9
H

A few drops of sodium hydroxide solution are added to iron(II) sulfate solution and a precipitate forms.

Which ionic equation, with state symbols, represents the formation of the precipitate?

[1]
A

Fe2+(aq)+OH−(aq)→FeOH(s)\mathrm{Fe^{2+}(aq) + OH^{-}(aq) \rightarrow FeOH(s)}Fe2+(aq)+OH−(aq)→FeOH(s)

B

Fe3+(aq)+3OH−(aq)→Fe(OH)3(s)\mathrm{Fe^{3+}(aq) + 3OH^{-}(aq) \rightarrow Fe(OH)_{3}(s)}Fe3+(aq)+3OH−(aq)→Fe(OH)3​(s)

C

Fe2+(aq)+2OH−(aq)→Fe(OH)2(aq)\mathrm{Fe^{2+}(aq) + 2OH^{-}(aq) \rightarrow Fe(OH)_{2}(aq)}Fe2+(aq)+2OH−(aq)→Fe(OH)2​(aq)

D

Fe2+(aq)+2OH−(aq)→Fe(OH)2(s)\mathrm{Fe^{2+}(aq) + 2OH^{-}(aq) \rightarrow Fe(OH)_{2}(s)}Fe2+(aq)+2OH−(aq)→Fe(OH)2​(s)

Markscheme

10.1 Qualitative analysis: tests for ions Questions

  1. GCSE
  2. /Chemistry
  3. /10.1 Qualitative analysis: tests for ions

35 exam-style questions on Edexcel GCSE Chemistry 10.1 Qualitative analysis: tests for ions, covering 10.1.1 Principles of ion tests and flame tests, 10.1.2 Tests for cations and for ammonia, 10.1.3 Tests for anions, 10.1.4 Identification of ions in unknown salts, and 10.1.5 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.

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