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8.3 Identification of ions by chemical and spectroscopic means

8.3 Identification of ions by chemical and spectroscopic means

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Question 1

An architectural conservator is investigating a historical mortar sample, which consists mainly of calcium carbonate.

a.

How could the conservator test a fragment of the mortar sample to show the presence of carbonate ions?

Complete the sentences by choosing the correct substance from the box below.

[ acidified barium chloride, limewater, nitric acid, silver nitrate, sodium hydroxide ]

  • The substance added to the mortar sample is _____________________
  • The gas produced is identified using _____________________
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b.

When heated strongly, calcium carbonate undergoes thermal decomposition:

calcium carbonate→calcium oxide+carbon dioxide \text{calcium carbonate} \rightarrow \text{calcium oxide} + \text{carbon dioxide} calcium carbonate→calcium oxide+carbon dioxide

To heat the sample, the conservator uses a spirit burner that burns liquid ethanol (C2H5OH\text{C}_2\text{H}_5\text{OH}C2​H5​OH).

Give two ways in which carbon dioxide, a greenhouse gas, is released into the atmosphere during this procedure.

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Markscheme

8.3 Identification of ions by chemical and spectroscopic means Questions

  1. GCSE
  2. /Chemistry
  3. /8.3 Identification of ions by chemical and spectroscopic means

29 exam-style questions on AQA GCSE Chemistry 8.3 Identification of ions by chemical and spectroscopic means, covering 8.3.1 Flame tests, 8.3.2 Metal hydroxides, 8.3.3 Carbonates, 8.3.4 Halides, 8.3.5 Sulfates, 8.3.6 Instrumental methods, and 8.3.7 Flame emission spectroscopy. Each one has a worked solution and a mark scheme showing where the marks go.

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