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8.2 Identification of common gases

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Question 7
H

Limewater is an aqueous solution of calcium hydroxide. A student bubbles carbon dioxide through limewater. The equation for the reaction is:

Ca(OH)2(aq)+CO2(g)→CaCO3(s)+H2O(l)\text{Ca(OH)}_2(\text{aq}) + \text{CO}_2(\text{g}) \rightarrow \text{CaCO}_3(\text{s}) + \text{H}_2\text{O}(\text{l})Ca(OH)2​(aq)+CO2​(g)→CaCO3​(s)+H2​O(l)

a.

Give the observation the student makes.

[1]
b.

Explain this observation. Use the equation.

[2]
c.

The student repeats the test using sodium hydroxide solution in place of limewater. No change is seen. Suggest why sodium hydroxide solution is not used as the test for carbon dioxide.

[1]
Markscheme

8.2 Identification of common gases Questions

  1. GCSE
  2. /Chemistry
  3. /8.2 Identification of common gases

40 exam-style questions on AQA GCSE Chemistry 8.2 Identification of common gases, covering 8.2.1 Test for hydrogen, 8.2.2 Test for oxygen, 8.2.3 Test for carbon dioxide, and 8.2.4 Test for chlorine. Each one has a worked solution and a mark scheme showing where the marks go.

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