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Which one of the following can be used as an acid-base indicator by a visually impaired student?

(a) Litmus

(b) Turmeric

(c) Vanilla essence

(d) Petunia leaves

Answers (1)

Answer: (c)

Vanilla essence is an olfactory indicator. So, its smell is different in acidic and basic media, which can be detected easily by a visually impaired student. If a basic solution is added to vanilla extract, then we cannot detect the characteristic smell of vanilla extract. An acidic solution does not destroy the smell of vanilla extract.

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