Question

write a principle on how an olfactory indicator works​

Answer 1

Answer:

Those substances whose smell 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 characteristic smell cannot be detected. Onion and vanilla extract are olfactory indicators.

Answer 2

Explanation:

Characteristics: 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.