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
51–60 of 66 · Easy
Question 51
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 52
1 mark · Easy
Answer and see the solution →Complete the ionic equation for the formation of silver chloride: Ag^+(aq) + ___(aq) → AgCl(s)
Question 53
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 54
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.
Question 55
1 mark · Easy
Answer and see the solution →State, according to the Arrhenius theory, what an alkali produces in water.
Question 56
3 marks · Easy
Answer and see the solution →Ammonia reacts with hydrochloric acid to form ammonium chloride. Use the Bronsted-Lowry theory to explain this reaction.
(a)[1 mark]State which reactant acts as the acid.
(b)[1 mark]State which reactant acts as the base.
(c)[1 mark]Explain your answers in terms of proton transfer.
Question 57
2 marks · Easy
Answer and see the solution →For the following reaction, identify the Bronsted-Lowry acid and base on the left-hand side.
(a)[1 mark]Identify the acid.
(b)[1 mark]Identify the base.
Question 58
2 marks · Easy
Answer and see the solution →Describe how the hydroxonium ion, H_3O^+, forms when an acid is added to water, and explain its importance in acid–base reactions.
Question 59
3 marks · Easy
Answer and see the solution →The table shows whether these reactions occur in water according to the Arrhenius and Bronsted-Lowry theories.
Reactions and Theories Reaction Explained by Arrhenius? Explained by Bronsted-Lowry? HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l) Yes Yes NH3(aq) + H2O(l) → NH4+(aq) + OH-(aq) No Yes HCl(g) + NH3(g) → NH4Cl(s) No Yes (a)[1 mark]According to the table, which theory can explain all three reactions?
(b)[1 mark]Which reaction(s) are explained only by the Bronsted-Lowry theory, not the Arrhenius theory?
(c)[1 mark]State one key difference between the two theories based on the reactions above.
Question 60
1 mark · Easy
Answer and see the solution →State what happens to a base in a Bronsted-Lowry acid–base reaction.