For dilution of concentrated acid, we should add:

water into concentrated acid.

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concentrated acid into water.

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first water into acid and then more acid.

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first water into acid and then more water.

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Solution

The correct option is B 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.

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