Question

We know that onion is an olfactory indicator and that it's smell is retained in acid, then why do onions become odourless when soaked in vineger?

Answer 1

Olfactory Indicators are those indicators which retain their smell in acids and their smell vanishes in bases. Onions do not become odourless when they are soaked in vinegar as vinegar contains acetic acid. But we cannot detect this smell with our nose because the vinegar gets absorbed into the onion and the smell of vinegar overthrows the smell of onion for it is a very strong smell.

Answer 2

The onion will emit the smell of the vinegar due to the fact that vinegar has more profound smell.

Explanation:

• An olfactory indicator is the material or substance whose smell may vary according to the acidic or basic solution in which the material being added.
• The olfactory indicators indicate the smell of material in which they are added.
• The onion is a vegetable which exhibit a strong smell but the vinegar consists of acetic acid which have profound smell over the onion thus onion which is dipped in the vinegar emits the smell of the vinegar.

Learn more about onion:

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