Question

Alcl3 forms white fume in presence of moist air why?

Answer 1

In Moist air Anhydrous Aluminium (III) Chloride reacts with the moisture in air whereby it is partly hydrolyzed to form Hydrochloric gas which is otherwise known as HCl gas.

When the HCl gas combines with the moist air white fumes are observed.

This reaction can be summarized in the following reaction equation.

AlCl₃  +  3H₂O   ------------------>   Al(OH)₃  +  3HCl  ( White fumes)

From the explanations above we can say :

The white fumes = HCL gas

Reason for the production of the white fumes = The Aluminium (iii) Chloride is partly hydrolysed in moist air to form HCL gas.