Why is acid added to water for dilution and hot water to acid ?

Explanation

The process of dissolving an acid or a base in water a highly exothermic one. Care must be taken while mixing concentrated nitric acid or sulphuric acid with water. he acid must always be added slowly to water with constant hirring. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. The glass container may also break due to excessive heating.