Question

what is olfactory indicators?

Answer 1

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Olfactory indicators are the substances whose smell (or odour) changes in acidic o r basic solutions. When an acid or base is added to it, then its characteristic smell cannot be detected.

For e.g. a cloth with onion smell, if treated with sodium hydroxide solution, the smell of onions vanishes. Hydrochloric acid does not change the smell of onions when treated.

Vanilla extract is also an olfactory indicator.

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Answer 2

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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. Onion , clove oil and vanilla extract are examples.

A Gustatory indicator is a substance whose taste varies depending on whether it is mixed with an acidic or basic solution.