Question

A person is caused with burns while adding water into a concentrated acid.What was the reason behind it?

Answer 1

HEYA
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4 answers · Chemistry 

 Best Answer

(1) When water and acid mix, heat is released. This heat comes from energy stored in chemical bonds as well as the process of dissolving the acid into the water. 

(2) Pure or highly concentrated acids are usually more dense than water, so when water is poured into a container of acid, the water tends to float on top of the acid (unless you stir quickly). The water and acid meet at a thin interface between the two liquids. All of the heat is generated in that small region. 

(3) Therefore, the temperature of the surrounding liquid can quickly reach the boiling point. Rapid boiling and spattering is likely. 

(4) Pouring acid into water is safer because the acid sinks through the water, extending the volume through which the two are mixing. This helps distribute the heat of mixing more thoroughly and prevents either liquid from reaching its boiling point. Also, if you pour acid into water and something splashes out of the beaker, it's more likely to be water than acid. 

The same rules apply for mixing concentrated base solutions with water. 

I hope that helps. Good luck!

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Answer 2

hcl is dangerous dense acid which turns out when we put water in it