Preparation of salts: past paper questions

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• Question 24May/June 2026, paper 11Multiple choice1 mark

  Copper(II) sulfate is prepared by adding copper(II) oxide to dilute sulfuric acid. The steps used to obtain copper(II) sulfate crystals are listed. 1 Warm the filtrate until concentrated.

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• Question 18Oct/Nov 2025, paper 11Multiple choice1 mark

  Which pair of reactants are both soluble in water and mix to form a precipitate?

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• Question 19Oct/Nov 2024, paper 11Multiple choice1 markHas a diagram

  Which row describes the solubility of lead(II) chloride and lead(II) sulfate in water?

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• Question 18Oct/Nov 2023, paper 11Multiple choice1 mark

  Copper(II) sulfate is formed by reacting excess solid copper(II) carbonate with dilute sulfuric acid. Which processes are part of the preparation of solid copper(II) sulfate?

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• Question 18May/June 2026, paper 12Multiple choice1 mark

  Magnesium sulfate is a soluble solid which is formed when insoluble magnesium oxide reacts with dilute sulfuric acid. Which method is used to prepare solid magnesium sulfate?

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• Question 19Oct/Nov 2025, paper 12Multiple choice1 mark

  Which substances react with dilute hydrochloric acid to form aqueous copper(II) chloride?

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• Question 21Oct/Nov 2024, paper 11Multiple choice1 mark

  Four steps in the preparation of a soluble salt from a dilute acid and a solid metal oxide are listed. 1 Warm the dilute acid. 2 Evaporate the solution to half of its volume and allow to cool.

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• Question 20Oct/Nov 2023, paper 12Multiple choice1 mark

  Which salt is insoluble?

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• Question 24May/June 2026, paper 12Multiple choice1 mark

  Which alkali and acid react to produce a salt in which both the cation and anion are used to make a fertiliser?

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• Question 22Oct/Nov 2025, paper 13Multiple choice1 mark

  Which three compounds are all insoluble in water?

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• Question 23Oct/Nov 2024, paper 12Multiple choice1 mark

  The following steps are done to prepare solid magnesium sulfate.

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• Question 22Oct/Nov 2024, paper 13Multiple choice1 markHas a diagram

  The solubility of some salts is shown.

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• Question 19Oct/Nov 2023, paper 21Multiple choice1 mark

  Which type of reaction is represented by the equation shown?

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• Question 22May/June 2026, paper 21Multiple choice1 mark

  Which statement defines the term water of crystallisation?

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• Question 20Oct/Nov 2025, paper 22Multiple choice1 mark

  Which method is used to prepare a pure, dry sample of lead(II) chloride?

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• Question 19Oct/Nov 2024, paper 21Multiple choice1 markHas a diagram

  Copper(II) sulfate is made when copper(II) carbonate reacts with dilute sulfuric acid. $${\text{CuCO}}_3+{\text{H}}_2{\text{SO}}_4\to {\text{CuSO}}_4+{\text{H}}_2\text{O}+{\text{CO}}_2$$ Pure copper(II) sulfate crystals are obtained.

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• Question 21Oct/Nov 2023, paper 22Multiple choice1 mark

  Which method is used to produce insoluble salts?

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• Question 22May/June 2026, paper 22Multiple choice1 mark

  Four aqueous substances are listed. 1 ammonium carbonate 2 calcium sulfate 3 potassium chloride 4 sodium nitrate Which two substances, when added together, will give a precipitate?

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• Question 7Oct/Nov 2025, paper 31Structured11 marksHas a diagram

  Fig. 7.1 shows the apparatus used to electrolyse dilute sulfuric acid using inert electrodes. Fig. 7.1 State what is meant by the term electrolysis.

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• Question 22Oct/Nov 2024, paper 23Multiple choice1 markHas a diagram

  Which row describes and gives the formula of hydrated copper(II) sulfate?

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• Question 4Oct/Nov 2023, paper 42Structured14 marksHas a diagram

  This question is about lead(II) chloride, ${\mathrm{P}\mathrm{b}\mathrm{C}\mathrm{l}}_2$. A student prepares a sample of insoluble lead(II) chloride, ${\mathrm{P}\mathrm{b}\mathrm{C}\mathrm{l}}_2$, by mixing aqueous solutions of two salts in a beaker. Identify two soluble salts suitable for making lead(II) chloride when mixed together.

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• Question 24May/June 2026, paper 23Multiple choice1 mark

  Which salt is insoluble in water?

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• Question 3Oct/Nov 2025, paper 41Structured14 marks

  A student makes crystals of the salt sodium sulfate, $\mathrm{N}{\mathrm{a}}_2\mathrm{S}{\mathrm{O}}_4$. The student reacts $0.200{\text{ mol/dm}}^3$ dilute sulfuric acid, ${\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4(\mathrm{a}\mathrm{q})$, with aqueous sodium hydroxide, $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}(\mathrm{a}\mathrm{q})$. The student uses the following steps.

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• Question 23Oct/Nov 2024, paper 23Multiple choice1 mark

  The equations for three reactions are shown.

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• Question 4Oct/Nov 2023, paper 43Structured15 marks

  This question is about sulfuric acid and salts that are made from sulfuric acid. Zinc reacts with dilute sulfuric acid. Aqueous zinc sulfate is one of the products.

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• Question 3May/June 2026, paper 42Structured15 marks

  The salt zinc sulfate is prepared by adding excess solid zinc carbonate to dilute sulfuric acid. Complete the equation for this reaction.

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• Question 3Oct/Nov 2025, paper 42Structured13 marks

  A student prepares a sample of the insoluble salt barium sulfate, ${\text{BaSO}}_4$. The student adds aqueous sodium sulfate, ${\text{Na}}_2{\text{SO}}_4(\text{aq})$, to aqueous barium chloride, ${\text{BaCl}}_2(\text{aq})$. The student carries out the following steps.

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• Question 7Oct/Nov 2024, paper 31Structured10 marksHas a diagram

  This question is about acids, bases and salts. Crystals of potassium chloride can be made by reacting an acid with an alkali. Name the acid and the alkali used.

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• Question 1May/June 2026, paper 61Structured8 marksHas a diagram

  A student tries to make crystals of hydrated copper(II) sulfate, ${\mathrm{C}\mathrm{u}\mathrm{S}\mathrm{O}}_4\cdot 5{\mathrm{H}}_2\mathrm{O}$. Crystals of hydrated copper(II) sulfate are blue. The student makes aqueous copper(II) sulfate by reacting copper(II) carbonate with dilute sulfuric acid.

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• Question 5Oct/Nov 2025, paper 43Structured12 marks

  This question is about metallic compounds. Insoluble metal salts, such as lead(II) sulfate, are made by precipitation. When aqueous lead(II) ions react with aqueous sulfate ions, a precipitate of lead(II) sulfate forms.

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