WAEC Chemistry 2011 Theory — Question 28
Question 28 of 31 from the West African Examinations Council (WAEC) Chemistry 2011 Theory paper, with the correct answer and a full explanation.
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8b(i) Give one use of each of the following compounds: I. NaHCO3; II. CaSO4; III. CaCO3. (ii) State a drying agent that can be used for each of the following gases: I. SO2; II. HCl; III. NH3.
Model answer
(i) NaHCO3 is used for manufacturing baking powder. CaSO4 is used for making plaster of Paris. CaCO3 is used in the manufacture of glass. (ii) SO2 can be dried with conc. H2SO4. HCl can be dried with conc. H2SO4. NH3 can be dried with CaO.
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