Question

while diluting an acid why is recommended that the acid should be added to water and not water to acid

Answer 1

Dilution of concentrated acid is an exothermic process. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. When the acid is added to water slowly with constant stirring, the mixture will not splash out.

Answer 2

while diluting an acid , we should add acid to water and not water to acid as during dilluting when water is added to acid which produces heat and is an exothermic reaction for safety it is recommended that acid should be added to water.