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Question
In the laboratory preparation of carbon dioxide by action of a dilute acid on a metallic carbonate give a reason for:
(i) use of a washer bottle containing cone. H2SO4 in the preparation
(ii) Not collecting the prepared gas over water
(iii) Not using dilute sulphuric acid as a reactant in the preparation.
Solution
- Cone. H2SO4 used in washer bottle absorbs moisture from the gas.
- C02 is soluble in water and hence is not collected over water.
- Dil. sulphuric acid is not used as reactant. Since H2SO4 reacts with calcium carbonate forming- a coating of insoluble calcium sulphate [CaSO4]. The reaction slowly comes to a stop.
\[\ce{CaCO3 + H2SO4(dil.)->\underset{\text{Insoluble}}{CaSO4} + H2O + CO2}\]
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