Question

What should we add acid into water for diluting and not water into acid.

Answer 1

Answer:

Always add acid to water and not the other way around.

The hydration reaction uses all the water (acid is the limiting reactant), generating a lot of heat. The solution violently boils, spitting concentrated acid out of its container.

Explanation:

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Answer 2

Answer:

So much heat is released that the solution may boil very violently, splashing concentrated acid out of the container and all this because the reaction is exothermic. ... So it is always safer to add acid to water, and not water to acid.