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
111–120 of 156
Question 111
5 marks · Hard
Answer and see the solution →A student is asked to prepare pure ammonium sulfate crystals using ammonia solution and dilute sulfuric acid in the laboratory.
(a)[2 marks]Explain why the titration method must be used instead of the excess solid method for this preparation.
(b)[2 marks]State two practical reasons why an indicator is not added to the acid and alkali mixture when making the final batch of ammonium sulfate for crystallisation.
(c)[1 mark]Describe what the student should do after mixing the correct volumes of acid and alkali, to obtain pure, dry crystals of ammonium sulfate.
Question 112
2 marks · Hard
Answer and see the solution →Give two steps the student must follow to make pure potassium chloride crystals using titration and crystallisation with potassium hydroxide and hydrochloric acid.
Question 113
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 114
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 115
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 116
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.
Question 117
3 marks · Easy
Answer and see the solution →A student mixes different pairs of solutions and records whether a precipitate forms. The results are shown in the table below.
Solution 1 Solution 2 Observation Magnesium sulfate Sodium carbonate White precipitate Potassium chloride Sodium nitrate No precipitate Calcium nitrate Sodium sulfate White precipitate Use the table to answer the questions.
(a)[1 mark]Which pair of solutions does NOT produce an insoluble salt?
(b)[1 mark]Name one insoluble salt formed in these reactions.
(c)[1 mark]Give a reason why no precipitate forms when potassium chloride and sodium nitrate are mixed.
Question 118
1 mark · Easy
Answer and see the solution →Complete the ionic equation for the formation of silver chloride: Ag^+(aq) + ___(aq) → AgCl(s)
Question 119
3 marks · Easy
Answer and see the solution →The following reaction occurs when lead(II) nitrate and sodium sulfate solutions are mixed:
(a)[1 mark]Name the precipitate formed.
(b)[2 marks]Identify all the spectator ions in this reaction.
Question 120
2 marks · Easy
Answer and see the solution →A student wishes to make an insoluble salt of strontium sulfate by mixing two suitable solutions.
Name two solutions the student can mix, and give the balanced chemical equation for the reaction.