May/June 2026 Paper 42

2026 · 6 questions · 45 parts · 80 marks

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3(a)Preparing SaltsEasy1 mark

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

ZnC O_{3} + H_{2} S O_{4} \to ZnS O_{4} + \dots\dots\dots\dots + \dots\dots\dots\dots

Two answers required.

3(b)Preparing SaltsEasy1 mark

Name one other zinc compound that reacts with dilute sulfuric acid to produce zinc sulfate.

3(c)Preparing SaltsEasy1 mark

The reaction is complete when no more zinc carbonate dissolves and a white solid of excess zinc carbonate is seen in the reaction mixture. State one other observation which shows the reaction is complete.

3(d)(i)Solutions SolubilityEasy1 mark

200 cm

^{3}

of solution A contains 30 g of dissolved ZnSO

_{4}

. The maximum concentration of ZnSO

_{4}

at room temperature is 60 g in 100 cm

^{3}

of water. State the term used to describe a solution containing the maximum concentration of solute.

3(d)(ii)Solutions SolubilityEasy1 mark

Water is allowed to evaporate from solution A. Determine the volume of solution A when ZnSO

_{4}

crystals first appear.

volume =

3(d)(iii)Solutions SolubilityEasy1 mark

Solution B is formed when solution A is evaporated until 20 cm

^{3}

remains. Calculate the mass of ZnSO

_{4}

that is formed from solution B.

mass =

3(e)(i)Preparing SaltsEasy2 marks

Lead(II) sulfate, PbSO

_{4}

, is an insoluble salt which forms when an aqueous lead(II) salt reacts with an aqueous sulfate salt. Name a lead(II) salt and a sulfate salt that will form lead(II) sulfate.

lead(II) salt

sulfate salt

3(e)(ii)Preparing SaltsEasy1 mark

Name this technique of insoluble salt preparation.

3(e)(iii)Preparing SaltsMedium3 marks

Describe how pure lead(II) sulfate can be obtained from the reaction mixture.

Answer

0 words

3(e)(iv)Formulae Chemical EquationsEasy2 marks

Write the ionic equation for this reaction. Include state symbols.

Answer

0 words

3(e)(v)Preparing SaltsEasy1 mark

Name another insoluble sulfate salt that can be prepared by this method.