Question

Why the acid must always be added slowly to water with constant stirring?

Answer 1

Because when acid reacts with water it produce good amount of heat ,produce H+ ions vigorously
sometimes some portion also comes out from the mixture.

so when we do stiring and adding acid to water then it will be no more harmful.

Answer 2

The acid must always be added slowly to water with constant stirring. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. The glass container may also break due to excessive local heating.

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