Contact process for manufacturing of sulphuric acid:

The oleum obtained is then dissolved in water to obtain concentrated sulphuric acid. H 2 SO 4 + SO 3 (g) → H 2 S 2 O 7 (l) H 2 S 2 O 7 (l) + H 2 O (l) → 2H 2 SO 4 Uses of Sulphuric Acid In