1.

What are olfactory indicators?

Answer»

There are certain substances whose odour (smell)changes in acidic or basic solutions. These substances are called olefactory indicators. The olefactory indicators have a characteristics odour. This odour in olefactory indicators is changed in acidic or basic solution and helps us in detecting whether a given sample solutions is acidic or basic in nature.

Ex : Vanilla essence has characteristic pleasant smell in acid solution and no smell in alkali solution.



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