Chemistry
(a) Name the chemicals required for the preparation of carbon dioxide in the laboratory.
(b) How will you collect the gas?
(c) Write the balanced chemical equation for the above reaction.
(d) Draw a labelled diagram for the preparation of CO2 in the laboratory.
(e) Why is sulphuric acid not used for the preparation of carbon dioxide in the laboratory?
Carbon dioxide
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Answer
(a) The chemicals required for the preparation of carbon dioxide in the laboratory are:
- Marble chips (CaCO3)
- Dilute hydrochloric acid
(b) The gas is collected by the upward displacement of air.
(c) CaCO3 + 2HCl ⟶ CaCl2 + H2O + CO2 (g)
(d) Laboratory preparation of carbon dioxide :
(e) Dilute sulphuric acid when reacts with marble chips (CaCO3) forms calcium sulphate. It is insoluble in water so it covers the marble chips and stops the reaction.
CaCO3 + H2SO4 ⟶ CaSO4 + H2O + CO2 (g)
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