Question

why we need to pour acid to water but not the other way​

Answer 1

Answer:

Adding more acid releases more heat. If you add water to acid, you form an extremely concentrated solution of acid initially. So much heat is released that the solution may boil very violently, splashing concentrated acid out of the container! ... So Always Add Acid to water, and never the reverse.

Answer 2

Answer:

A large amount of heat is released when strong acids are mixed with water. If you add acid to water, the solution that forms is very dilute and the small amount of heat released is not enough to vaporize and spatter it. So Always Add Acid to water, and never the reverse.

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