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4.2 Reactions of acids

4.2 Reactions of acids

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Question 6

This question is about acids, alkalis, and titrations.

a.

Which ion is released by all acids when they dissociate in aqueous solution?

  • OH−\text{OH}^-OH−
  • H+\text{H}^+H+
  • Na+\text{Na}^+Na+
[1]
b.

What is the general name given to the reaction between an acid and an alkali to form a salt and water?

  • Decomposition
  • Displacement
  • Neutralisation
  • Combustion
[1]
c.

Balance the chemical equation for the reaction between nitric acid (HNO3\text{HNO}_3HNO3​) and barium hydroxide (Ba(OH)2\text{Ba(OH)}_2Ba(OH)2​):

‾HNO3+Ba(OH)2→Ba(NO3)2+‾H2O \underline{\quad}\text{HNO}_3 + \text{Ba(OH)}_2 \rightarrow \text{Ba(NO}_3)_2 + \underline{\quad}\text{H}_2\text{O} ​HNO3​+Ba(OH)2​→Ba(NO3​)2​+​H2​O
[1]
d.

Barium hydroxide is a strong alkali. What is the most likely pH of a barium hydroxide solution?

  • 111
  • 555
  • 777
  • 131313
[1]
e.

Which piece of equipment is most suitable to measure and transfer exactly 25.0 cm325.0\text{ cm}^325.0 cm3 of the barium hydroxide solution into a conical flask as accurately as possible?

  • Beaker
  • Measuring cylinder
  • Volumetric pipette
  • Boiling tube
[1]
f.

Describe the step-by-step procedure a student should carry out to perform a titration to find the exact volume of nitric acid needed to neutralise the barium hydroxide solution, using a burette, a conical flask, and a suitable indicator.

[4]
Markscheme

4.2 Reactions of acids Questions

  1. GCSE
  2. /Chemistry
  3. /4.2 Reactions of acids

40 exam-style questions on AQA GCSE Chemistry 4.2 Reactions of acids, covering 4.2.1 Reactions of acids with metals, 4.2.2 Neutralisation of acids and salt production, 4.2.3 Soluble salts, 4.2.4 The pH scale and neutralisation, 4.2.5 Titrations, and 4.2.6 Strong and weak acids (HT only). Each one has a worked solution and a mark scheme showing where the marks go.

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