Question

Why ${\mathrm{SO}}_3$ is not added directly to the water?

Answer 1

Sulfur Trioxide (${\mathrm{SO}}_3$) is not added directly to the water (${\mathrm{H}}_2\mathrm{O}$) to form Sulphuric acid (${\mathrm{H}}_2{\mathrm{SO}}_4$) as:

• When it is added directly to water the formation of Sulphuric acid is seen and the reaction is highly exothermic which could cause burning.
• It results in the production or formation of the dense fog of sulphuric acid which is very hard or difficult to condense.
• Sulphuric acid formed is highly corrosive in nature.