Oxford AQA IGCSE · Combined Science (9204)

Acids, bases and salts: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Acids, bases and salts.

10 questions26 marksFree, no account

Question 1

1 mark

Which of the following ions is specifically responsible for making an aqueous solution alkaline?

Question 2

1 mark

Neutralisation reactions occur when an acid reacts with an alkali. Which of the following ionic equations correctly represents the general reaction between hydrogen ions and hydroxide ions to produce water?

Question 3

1 mark

A student needs to prepare a pure, dry sample of lead(II) sulfate, which is an insoluble salt. Which of the following experimental procedures is most suitable?

Question 4

1 mark

In the study of acids and bases, what is the specific definition of an alkali?

Question 5

1 mark

In the preparation of a soluble salt from an acid and an insoluble base, why is the base added until no more will react before filtering the mixture?

Question 6

2 marks

State the pH of a neutral solution and identify the ion that is responsible for making an aqueous solution acidic.

Write your answer out first, then check it against the worked solution.

Question 7

4 marks

Explain why ammonia is classified as an alkali when dissolved in water and name the specific ammonium salt produced when it reacts with nitric acid.

Write your answer out first, then check it against the worked solution.

Question 8

6 marks

Outline the experimental procedure to prepare a pure, dry sample of the insoluble salt silver chloride, starting from silver nitrate and sodium chloride solutions.

Write your answer out first, then check it against the worked solution.

Question 9

4 marks

A student investigates three solutions, A, B, and C, using universal indicator to determine their properties.
Solution A: Turns the indicator red.
Solution B: Turns the indicator purple.
Solution C: Turns the indicator green.

(a) Identify the nature of Solution A and Solution B as either acidic or alkaline.
(b) State the approximate pH value of Solution C and identify its nature.
(c) Solution A contains a high concentration of \(H^+\) ions. Describe what happens to the pH of the solution as Solution B is slowly added to it, and write the ionic equation for the reaction that occurs between the ions in the two solutions.

Write your answer out first, then check it against the worked solution.

Question 10

5 marks

A student is asked to prepare a pure, dry sample of magnesium sulfate crystals using magnesium oxide (an insoluble base) and sulfuric acid.

(a) Write a balanced symbol equation for this reaction, including state symbols.
(b) Describe the experimental method the student should use. In your answer, explain why the magnesium oxide must be added in excess and how the student can ensure that all the sulfuric acid has reacted.
(c) Name the physical process used to obtain solid crystals from the resulting solution.

Write your answer out first, then check it against the worked solution.

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

You've seen the model answer. Now get yours marked.

This page can show you how a good answer looks. It cannot tell you what your answer was missing. thinka marks your written work against the real mark scheme in about 15 seconds.

Get My Answers Marked Back to the notes

Want more questions like these? Get a fresh set on this topic, marked as you go.