Question

While preparing dilute sulphuric acid from concentrated sulphuric acid in laboutry the concentrated sulphuric acid is added slowly to water with constant stirring because

Answer 1

1 highly exothermic reaction
2 prevent spurting of acid

Answer 2

Explanation:

The addition of concentrated sulphuric acid into water is a highly exothermic reaction. If acid is not added carefully and slowly into the water, it can lead to spurting of acid which can cause burns on the skin, eyes etc.

When we add concentrated sulphuric acid slowly into the water then the exothermic reactions starts but when we stir the mixture then it starts to cool down and does not spill out. Again on adding the concentrated sulphuric acid, the same process occurs and it is cooled down by stirring the mixture.