Question

How we test whether the solution is acidic or basic in nature by using olfactory indicators?

Answer 1

when acids or bases are added to olfactory indicators then there is a change in the smell of indicators.One olfactory indicator changes its smell when it reacts with either acid or a base. 

Answer 2

Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.