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4.2 Reactions of acids

4.2 Reactions of acids

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Question 18

A student produced a soluble salt by reacting zinc carbonate with dilute sulfuric acid.

This is the method used:

  1. Measure 40 cm340\text{ cm}^340 cm3 of dilute sulfuric acid into a beaker.
  2. Add zinc carbonate powder.
  3. Stir the mixture.
  4. Repeat steps 2 and 3 until zinc carbonate is in excess.
  5. Filter the mixture.
  6. Warm the filtrate gently until crystals start to appear.
  7. Leave the solution to cool and crystallise.
a.

Complete the word equation for the reaction:

zinc carbonate+sulfuric acid→_______________+_______________+carbon dioxide \text{zinc carbonate} + \text{sulfuric acid} \rightarrow \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} + \text{\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_} + \text{carbon dioxide} zinc carbonate+sulfuric acid→_______________+_______________+carbon dioxide
[1]
b.

Give one observation the student could make during Step 4 which shows that the zinc carbonate is in excess.

[1]
c.

Give one reason for filtering the mixture in Step 5.

[1]
d.

Name the equipment that can be used to warm the filtrate gently in Step 6.

[1]
e.

The maximum theoretical mass of the salt that could be produced using 40 cm340\text{ cm}^340 cm3 of the sulfuric acid is 12.5 g12.5\text{ g}12.5 g. The percentage yield of the zinc sulfate salt is 76.0%76.0\%76.0%. Calculate the mass of salt actually produced. Use the equation:

percentage yield=mass of salt actually producedmaximum theoretical mass of salt that could be produced×100 \text{percentage yield} = \frac{\text{mass of salt actually produced}}{\text{maximum theoretical mass of salt that could be produced}} \times 100 percentage yield=maximum theoretical mass of salt that could be producedmass of salt actually produced​×100
[2]
f.

Some salts can be produced by reacting dilute acids with a metal. Neither platinum nor sodium is used to produce a salt with dilute sulfuric acid. Give one reason why each metal is not used:

  • Platinum
  • Sodium
[2]
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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