Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Acids, Bases and Salt Preparations
156 practice questions
Topics covered
- Reactions of acids18 practice questions
- Reacting acids with bases19 practice questions
- Reacting acids with carbonates19 practice questions
- Salt preparations19 practice questions
- Making soluble salts (except sodium, potassium and ammonium salts)19 practice questions
- Making sodium, potassium and ammonium salts18 practice questions
- Making insoluble salts19 practice questions
- Theories of acids and bases19 practice questions
Practice questions
41–50 of 66 · Easy
Question 41
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 42
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 43
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 44
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 45
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 46
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 47
1 mark · Easy
Answer and see the solution →State the name of the insoluble salt formed when solutions of barium nitrate and potassium sulfate are mixed.
Question 48
3 marks · Easy
Answer and see the solution →A student wants to prepare a sample of insoluble silver iodide by mixing solutions of two soluble salts.
(a)[2 marks]Name a suitable silver salt solution and a suitable iodide salt solution the student could use.
(b)[1 mark]State the colour of the precipitate formed.
Question 49
2 marks · Easy
Answer and see the solution →Write a balanced ionic equation, including state symbols, for the formation of calcium carbonate as a precipitate from aqueous solutions.
Question 50
2 marks · Easy
Answer and see the solution →In the reaction between zinc nitrate solution and sodium carbonate solution, a precipitate forms.
Explain which ions are the spectator ions in this reaction.