Question 37
Sulphur and its CompoundsSO3 is NOT directly dissolved in water in the preparation of H2SO4 by the contact process because
- A.the reaction between SO3 and water is violently exothermic
- B.acid is usually added to water and never water to acid
- C.SO3 does not dissolve in water readily
- D.SO3 is an acid gas
Show the answer and explanation
Answer: A (the reaction between SO3 and water is violently exothermic)
Explanation
SO3 reacts with water so violently that it forms a fine acid mist that is hard to condense. It is dissolved in concentrated H2SO4 instead to form oleum.