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

This is because sulphuric acid is very concentrated so if we add water in sulphiric acid the extensive exothermic reaction take place and the beaker or test tube can brust up

Answer 2

Answer:

(i) Concentrated sulphuric acid (H2

SO4

) is a

hazardous, highly corrosive chemical. It has a

higher density than water and is hygroscopic,

which means that it absorbs water from the air.

(ii) In the process of dilution of concentrated

sulphuric acid with water, very large amount of

heat is liberated.

(iii) As a result, water gets evaporated instantaneously

along with splashing of acid which may cause an

accident.

(iv) To avoid this, required amount of water is

taken in a glass container and small quantity of

concentrated sulphuric acid at a time is added

with stirring.

(v) Therefore, only a small amount of heat is liberated

at a time.