Question

what would happen if dill. H2so4 in not added to water

Answer 1

Heya friend!!
Rajdeep here...

Generally, to dilute acids, we add concentrated acids on water, and not water on acid. If you add water on concentrate H2SO4 to dilute it, then, a huge amount of heat is produced (as the reaction is highly exothermic). This heat converts the water into steam. As this steam evaporates and comes out, it contains droplets of acid in it. Thus, spurting of acid can occur, which may lead to acid burns.

When you ad acid on water, density of acid is much more than that of water, so the heat formed gets distributed evenly in the whole water. The heat thus cannot change the ACID to steam, hence acid will not spurt this time.

Thanks!!