February/March 2026 Paper 62

2026 · 4 questions · 27 parts · 40 marks

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4Hard6 marks

Hydrated chromium(III) nitrate is a salt which is soluble in water. Hydrated chromium(III) nitrate is made by reacting the insoluble base chromium(III) oxide with dilute nitric acid. Chromium(III) oxide reacts very slowly with dilute nitric acid at room temperature.

Describe how to make pure, dry crystals of hydrated chromium(III) nitrate.

You are provided with chromium(III) oxide, dilute nitric acid and common laboratory apparatus.

Method