Olfactory Indicators, Olfactory indicators are special substances whose smell changes when they come in contact with acidic or basic substances, They help us identify acids and bases by observing a change in odour instead of a change in colour., Examples of Olfactory Indicators -Onion ,Vanilla essence ,Clove oil, How They Work, In acidic substances: The smell usually remains unchanged., In basic substances: The smell becomes weak or disappears., Example, Onion: Its smell remains in an acidic solution but disappears in a basic solution., Vanilla essence: Its smell remains in an acidic solution but cannot be detected in a basic solution., Clove oil: Its smell remains in an acidic solution but disappears in a basic solution., Olfactory indicators help identify acids and bases through a change in smell., They are useful natural indicators when colour change cannot be easily observed.

Olfactory Indicators

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