Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Making sodium, potassium and ammonium salts
18 practice questions
Practice questions
1–10 of 18
Question 1
1 mark · Easy
Answer and see the solution →Explain why the titration method must be used when preparing sodium salts from an acid and an alkali.
Question 2
3 marks · Easy
Answer and see the solution →A student wants to prepare pure potassium chloride crystals from potassium hydroxide solution and hydrochloric acid using titration.
(a)[1 mark]State the first step the student should carry out before adding acid.
(b)[1 mark]Describe how the student should use an indicator to find the endpoint of the reaction.
(c)[1 mark]Once the volumes have been determined, explain what the student must do to obtain pure potassium chloride crystals.
Question 3
2 marks · Easy
Answer and see the solution →Explain the role of methyl orange indicator in an acid–alkali titration to prepare potassium salts. Why does the indicator colour change at the endpoint? (2 marks)
Question 4
2 marks · Easy
Answer and see the solution →A student wants to prepare ammonium sulfate by titrating ammonium hydroxide ( ) with sulfuric acid ( ).
Write the balanced chemical equation for this reaction.
Question 5
1 mark · Easy
Answer and see the solution →State why you cannot use the 'add excess solid, then filter' method to prepare sodium salts from acid and sodium hydroxide.
Question 6
3 marks · Easy
Answer and see the solution →A student prepares pure potassium sulfate crystals from potassium hydroxide and sulfuric acid using titration.
(a)[1 mark]State the purpose of using an indicator during the titration.
(b)[2 marks]After finding the correct volumes, outline two steps the student must take to obtain pure potassium sulfate crystals.
Question 7
2 marks · Easy
Answer and see the solution →Write the balanced chemical equation for the preparation of sodium sulfate by titrating sodium hydroxide and sulfuric acid. State the number of moles of sodium hydroxide needed to react completely with 1 mole of sulfuric acid.
Question 8
2 marks · Normal
Answer and see the solution →Explain why titration is needed instead of the excess solid method when preparing potassium salts from acid and alkali solutions.
Question 9
4 marks · Normal
Answer and see the solution →A student needs to prepare pure sodium sulfate crystals using a titration of sulfuric acid and sodium hydroxide solutions.
(a)[1 mark]State the first step the student should take before starting the titration.
(b)[1 mark]Describe briefly how the student would use titration to find the correct volume of acid to neutralise the alkali.
(c)[2 marks]After identifying the correct volumes, outline two steps to obtain pure sodium sulfate crystals.
Question 10
3 marks · Normal
Answer and see the solution →Write the balanced chemical equation for the preparation of ammonium sulfate by titrating ammonia solution () with sulfuric acid ().
State the number of moles of ammonia needed to react with one mole of sulfuric acid and identify the formula for ammonium sulfate.