Question

For dilution of concentrated acid, we should add:

• A. first water into acid and then more acid.
• B. water into concentrated acid.
• C. concentrated acid into water.
• D. first water into acid and then more water.

Answer 1

The correct option is C concentrated acid into water.

Adding water to concentrated acid makes the solution to boil violently, splashing concentrated acid out of the container. There is a release of large amount of energy (an exothermic process) when hydration happens here. Hence, concentrated acid is added to water and not vice-versa.