Discussion
Sulphur trioxide is absorbed in concentrated sulphuric acid rather than in water because
Answer: C
Correct answer: absorption in water forms a persistent mist
Sulphur trioxide meeting water vapour forms sulphuric acid in the gas phase as an extremely fine mist, which passes straight through an absorption tower and is very difficult to collect. Absorbing into 98 per cent acid instead keeps the water activity low so the reaction happens in the liquid, and the acid produced is diluted back to 98 with a controlled water addition.
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