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Question

For dilution of concentrated acid, we should add:

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

The correct option is A 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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