AQA · Chemistry · 8462
GCSE Chemistry: Metal hydroxides
Chemical analysis · AQA GCSE Chemistry (8462), specification point 4.8.3.2. Cards are generated from the exam board's own specification for "Metal hydroxides", and every card links back to the page it came from. Separate science only. Specification © AQA — used with attribution.
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Which reagent is used to identify metal ions (cations) by forming hydroxide precipitates?
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Sodium hydroxide solution.
What colour precipitate do aluminium, calcium and magnesium ions form with sodium hydroxide solution?
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White.
Which white hydroxide precipitate dissolves in excess sodium hydroxide solution?
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Aluminium hydroxide (calcium and magnesium hydroxides do not).
How can you distinguish aluminium ions from calcium and magnesium ions using sodium hydroxide?
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All three form white precipitates, but only the aluminium hydroxide precipitate dissolves when excess sodium hydroxide is added.
What colour precipitate do copper(II) ions form with sodium hydroxide solution?
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Blue.
What colour precipitate do iron(II) ions form with sodium hydroxide solution?
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Green.
What colour precipitate do iron(III) ions form with sodium hydroxide solution?
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Brown.
A solution forms a brown precipitate with sodium hydroxide. Which metal ion is present?
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Iron(III), Fe³⁺.
Write the balanced ionic equation for copper(II) ions reacting with hydroxide ions.
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Cu²⁺(aq) + 2OH⁻(aq) → Cu(OH)₂(s)
Write the balanced ionic equation for iron(III) ions reacting with hydroxide ions.
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Fe³⁺(aq) + 3OH⁻(aq) → Fe(OH)₃(s)
Iron(II) ions form a ? precipitate with sodium hydroxide solution.
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green
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