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Chemical formulae, equations and calculations

Chemical formulae, equations and calculations

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Question 32

Sodium carbonate solution and dilute nitric acid react together to form carbon dioxide gas, which bubbles out of the mixture once the solution is saturated.

The equation for the reaction is:

Na2CO3(aq)+2HNO3(aq)→2NaNO3(aq)+H2O(l)+CO2(g) \text{Na}_2\text{CO}_3(\text{aq}) + 2\text{HNO}_3(\text{aq}) \rightarrow 2\text{NaNO}_3(\text{aq}) + \text{H}_2\text{O}(\text{l}) + \text{CO}_2(\text{g}) Na2​CO3​(aq)+2HNO3​(aq)→2NaNO3​(aq)+H2​O(l)+CO2​(g)

A student performs an experiment using the following conditions:

  • Concentration of sodium carbonate solution = 0.400 mol/dm30.400\text{ mol/dm}^30.400 mol/dm3
  • Volume of sodium carbonate solution = 40 cm340\text{ cm}^340 cm3
  • Volume of water = 20 cm320\text{ cm}^320 cm3
  • Volume of nitric acid = 40 cm340\text{ cm}^340 cm3 (the nitric acid is in excess)
a.

Calculate the mass of carbon dioxide, CO2\text{CO}_2CO2​, formed in this experiment. (ArA_rAr​: C=12\text{C} = 12C=12, O=16\text{O} = 16O=16)

[4]
b.

The solubility of carbon dioxide at room temperature is 1.6 g/dm31.6\text{ g/dm}^31.6 g/dm3. Use this information to explain whether any carbon dioxide gas escapes from the flask during the experiment.

[3]
Markscheme

Chemical formulae, equations and calculations Questions

  1. IGCSE
  2. /Chemistry
  3. /Chemical formulae, equations and calculations

80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.

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