Question

sulphur trioxide is said to be the anhydride of sulphuric acid.what does it mean?

Answer 1

Chemical compound obtained by the using the water from another compound is called as anhydride.

Sulphur trioxide is said to be the anhydride of sulphuric acid.

As, sulphuric acid is obtained by adding water molecules to sulphur trioxide, the reaction is as follows:

                                                             SO3 (g) + H2O (l) → H2SO4 (aq)