Identification of ions by chemical and spectroscopic means (chemistry only)

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1
Question 1
Easy

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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Identification of ions by chemical and spectroscopic means (chemistry only) Questions

  1. GCSE
  2. /Chemistry
  3. /Identification of ions by chemical and spectroscopic means (chemistry only)