Q.) How will you protect yourself from the heat
generated while diluting a concentrated
(a) By adding acid to water with constant stirring.
(b) By adding water to acid with constant stirring.
(c) By adding water to acid followed by base.
(d) By adding base to acid with constant stirring.
Ans. (a) By adding acid to water with constant stirring.
Explanation: Dilution of a concentrated acid is a highly exothermic process. If we add water to the concentrated acid, the mixture may splash and cause severe burn injuries due to the large amount of heat produced. Therefore, acid should be added to the water drop by drop with constant stirring so that the heat evolved may be absorbed by the water.