Question

why should water be never added dropwise to concentrated sulphuric acid?

Answer 1

This is because the reaction betweenacid and water is highly exothermic and so produces lot of heat. ... On the other hand, when we add acid to water, it is like adding a concentratedsolution to water in small amounts. So comparatively lesser amount of heat is released.

Answer 2

because the reaction of between acid and water are highly exothermic...