5(ii)
During the manufacture of sulphuric acid, a chemist collected the gas formed after catalytic oxidation of sulphur dioxide.
(a) Name the gas collected.
(b) Which acid is formed when the gas collected by the chemist is dissolved directly in water?
(c) Why should we not dissolve this gas directly in water?
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(a) Sulphur trioxide
(b) Sulphuric acid (H2SO4)
(c) Sulphur trioxide (SO3) does not dissolve in water satisfactorily and it gives a lot of heat and forms misty droplets of sulphuric acid which are difficult to condense and escape into the atmosphere. Hence, it is not directly dissolved in water.