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4.2 Reactions of acids

4.2 Reactions of acids

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Question 21

This question is about acids, alkalis, and titrations.

a.

Which ion do alkalis produce in aqueous solution?

  • H+\text{H}^+H+
  • OH−\text{OH}^-OH−
  • O2−\text{O}^{2-}O2−
[1]
b.

What is the name of the reaction when an acid reacts with an alkali?

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

Balance the chemical equation for the reaction between hydrochloric acid (HCl\text{HCl}HCl) and calcium hydroxide (Ca(OH)2\text{Ca(OH)}_2Ca(OH)2​):

‾HCl+Ca(OH)2→CaCl2+‾H2O \underline{\quad}\text{HCl} + \text{Ca(OH)}_2 \rightarrow \text{CaCl}_2 + \underline{\quad}\text{H}_2\text{O} ​HCl+Ca(OH)2​→CaCl2​+​H2​O
[2]
d.

Calcium hydroxide is alkaline. What is the most likely pH of a calcium hydroxide solution?

  • 222
  • 555
  • 777
  • 121212
[1]
e.

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

  • Beaker
  • Conical flask
  • Volumetric pipette
  • Measuring cylinder
[1]
f.

Describe the steps a student should take to perform a titration to find the volume of hydrochloric acid needed to neutralise the calcium hydroxide solution, using a burette, a conical flask, and an 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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