Question

What is the principle of olfactory indicators?

Answer 1

Answer:

An olfactory indicator works on the principle that when an acid or base is added, then its characteristic smell can be detected. (i) Onion has a characteristic smell. When a base (like NaOH) is added to a cloth strip treated with onion extract—then the smell is destroyed.

Explanation:

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Answer 2

Explanation:

The substances whose smell/odour changes in acidic or basic solution are called as olfactory indicators. It works on the Principle that when an acid or base is added to it, its characteristics smell can't be detected .

Characteristics: An olfactory indicator works on the principle that when an acid or base is added, then its characteristic smell can be detected. If a basic solution like sodium hydroxide solution is added to vanilla extract, then we cannot detect the pleasant smell of vanilla.

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