Olfactory Indicators


 
 
Concept Explanation
 

Olfactory Indicators

Olfactory indicators:

There are substances like onion juice, vanilla essence and clove oil which by change of their smell indicate whether the sample solution is acidic or basic. These are called olfactory indicators.

  • Onion: A few strips of cloth and finely cut pieces of onion are taken together in a polythene bag. The open end of the polythene bag is tied tightly with a thread and kept as such in a fridge for about 12 hours. During this period the cloth strips become saturated with the odour of onion. Two of the strips are now picked up. Over one of the strips 2 - 3 drops of an acidic solution are dropped. The strip acquires a characteristic smell. The other strip is similarly treated with a basic solution. This time the strip loses its smell.
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    Sample Questions
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    Question : 1

      In which of the following solutions vanilla essence losses its flavour?

    Right Option : D
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    Question : 2

    The substances whose odour changes in an acidic or basic media are called _________________.

    Right Option : C
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    Explanation
    Question : 3

    When 1—2 drops of vanilla essence are added to 1 ml of an ____________________ taken in a test tube, the smell of the vanilla essence does not change.

    Right Option : A
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    Explanation
     
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