Indicators


 
 
Concept Explanation
 

Indicators

Indicators:

Indicators are substances which show a change in colour when brought in contact with acids and bases. The solutions that do not show change in colour in any indicator are neither acidic nor basic and are called neutral substances. Eg: water, sodium chloride, sugar etc. the indicator so chosen that it gives a different colour for different pH values. This paper is called pH paper.

Indicator

Acid

Base

Blue litmus paper

Red

Blue

Red litmus paper

Red

Blue

Phenolphthalein

Colour less

Pink

Methyl orange

Red

yellow

 

 

 

 

 

 

 

 

Household Indicators:

(i) Turmeric juice: It is yellow in colour. It remains yellow in an acidic or neutral solution but turns deep brown in a basic solution.

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Sample Questions
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Question : 1

Which of the following are correct :

(a) Indicators are substances which show a change in colour when brought in contact with acids and bases.

(b) The solutions that do not show change in colour in any indicator are neither acidic nor basic and are called neutral substances.

(c) Acid turn blue litmus paper into red, whereas base shows no effect on blue litmus paper.

Right Option : D
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Question : 2

An indicator is a substance which shows the presence of a chemical substance by __________

Right Option : A
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Question : 3

 The solutions that do not show change in colour in any indicator are neither acidic nor basic and are called ____________________ .

Right Option : C
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