Question

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What do you mean by Olfactory indicators ?​

Answer 1

Those substances whose smell (or odour) changes in acidic or basic solutions are called olfactory indicators.

Onion and vanilla extracts are olfactory indicators.

Answer 2

An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration.

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