differentiate between acid base indicator and olfactory indicator
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Olfactory Indicators: Substances which change their smell when mixed with acid or base are known as olfactory indicators. For example onion, vanilla, clove, etc. Onion: Paste or juice of onion loses its smell when added with base. It does not change its smell with acid.
Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions. Consider an indicator which is a weak acid, with the formula HIn.
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Olfactory indicators can be used in the laboratory to test whether a solution is a base or an acid, a process called olfactory titration. ....
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