Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Making soluble salts (except sodium, potassium and ammonium salts)
19 practice questions
Practice questions
1–3 of 3 · Hard
Question 1
2 marks · Hard
Answer and see the solution →When making hydrated zinc sulfate crystals from zinc oxide and sulfuric acid, the final solution is left to cool so that crystals form. Explain, in two points, why crystallisation is used instead of evaporation to dryness to obtain hydrated salt crystals.
Question 2
5 marks · Hard
Answer and see the solution →A student prepares hydrated magnesium sulfate crystals by reacting magnesium carbonate with dilute sulfuric acid.
(a)[2 marks]Write the balanced symbol equation for the reaction between magnesium carbonate and dilute sulfuric acid.
(b)[1 mark]State the state symbols for each product.
(c)[2 marks]During the process, the solution is concentrated and then left to crystallise. Write the equation for the crystallisation step, including water of crystallisation.
Question 3
2 marks · Hard
Answer and see the solution →Describe two steps a student must carry out to obtain pure hydrated copper(II) sulfate crystals from a mixture of copper(II) oxide and dilute sulfuric acid, once the reaction has finished.