Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Salt preparations
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State whether each of the following compounds is soluble or insoluble in water, according to the solubility rules:
(a)Lead(II) sulfate
(b)[1 mark]Potassium carbonate
(b)[1 mark]Question 2
3 marks · Normal
Answer and see the solution →A student is given a sample of calcium hydroxide and is told that calcium hydroxide is only slightly soluble in water. Using the solubility rules, calculate how many of the following compounds are soluble in water:
Compound Sodium nitrate Barium sulfate Potassium carbonate Calcium sulfate Ammonium chloride State the total number of compounds from the table that are soluble in water.
Question 3
1 mark · Normal
Answer and check →Which method is most suitable for preparing a pure, dry sample of potassium nitrate in the laboratory?
- A.Reacting dilute nitric acid with potassium hydroxide and crystallising from solution
- B.Reacting potassium carbonate with dilute hydrochloric acid and filtering the mixture
- C.Mixing potassium nitrate with water and filtering out the excess solid
- D.Reacting potassium nitrate with silver nitrate and collecting the precipitate
Question 4
4 marks · Normal
Answer and see the solution →Iron(II) sulfate can be made by reacting an acid with a suitable base in the laboratory.
(a)Name two reactants you could use to prepare iron(II) sulfate.
(b)[1 mark]Write the balanced chemical equation for this reaction.
(c)[3 marks]Describe the steps you would take to obtain pure iron(II) sulfate crystals from the reaction mixture.
Question 5
4 marks · Normal
Answer and see the solution →A student wants to prepare a pure, dry sample of barium sulfate in the laboratory. Barium sulfate is insoluble in water.
(a)[1 mark]Name two suitable soluble solutions that could be mixed to prepare barium sulfate.
(b)[2 marks]Describe the steps the student should follow to obtain pure, dry barium sulfate from the mixture after the reaction is complete.
(c)[1 mark]Explain why filtration is necessary in this method.
Question 6
3 marks · Normal
Answer and see the solution →Copper(II) sulfate can be made by adding excess copper(II) oxide to dilute sulfuric acid.
(a)[1 mark]Explain why an excess of copper(II) oxide is added during the preparation.
(b)[2 marks]Describe what the student should do after all the acid has reacted, to obtain dry copper(II) sulfate crystals.
Question 7
4 marks · Normal
Answer and see the solution →The table below shows the solubility of different ionic compounds in water:
Solubility of Various Ionic Compounds in Water Compound Solubility Potassium nitrate Soluble Sodium chloride Soluble Calcium sulfate Almost insoluble Lead(II) chloride Insoluble Ammonium carbonate Soluble Copper(II) hydroxide Insoluble (a)[1 mark]Name one compound from the table that is insoluble in water.
(b)[1 mark]State the general rule for the solubility of nitrates.
(c)[2 marks]Identify a compound from the table that would be suitable for making a salt by precipitation, and explain your choice.
Question 8
2 marks · Normal
Answer and see the solution →State the solubility rules for (i) all chlorides, and (ii) all hydroxides, in water.