Indicators - Acids, Bases and Salts Notes | EduRev

Science Class 10

Class 10 : Indicators - Acids, Bases and Salts Notes | EduRev

The document Indicators - Acids, Bases and Salts Notes | EduRev is a part of the Class 10 Course Science Class 10.
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Indicators

The substances that show different colours in different mediums or the substances that are used to distinguish between an acid and base are called indicators.

Indicators - Acids, Bases and Salts Notes | EduRevColours of Different Indicators on pH scale

Indicators - Acids, Bases and Salts Notes | EduRevpH value shown by different coloursTypes of Indicators

1. Natural Indicators: The indicators obtained from plants are called natural indicators.
(a) Litmus

  • Litmus is a natural indicator which is extracted from “Lichens”, a plant belonging to thallophyta group. It is purple in colour. The pH range for litmus is 4.5 - 8.3 at room temperature.
  • There are 2 types of litmus solution:
    (i) Red Litmus: It is obtained by acidifying purple litmus extract
    (ii) Blue Litmus: It is obtained by making purple litmus extract alkaline
    In the laboratory litmus is available in the form of litmus paper; Red litmus and blue litmus paper.Indicators - Acids, Bases and Salts Notes | EduRevRed and Blue Litmus Paper

(b) Turmeric

  • It is yellow in colour and turns red in the base and remains yellow in acids. 

2. Synthetic Indicators: These indicators are manufactured in laboratories.
(a) Methyl Orange

  • It is orange in colour and turns red in acids and yellow in the base.

(b) Phenolphthalein

  • It is colourless and remains colourless in acids and turns pink in the base.

3. Olfactory Indicators: These indicators change their smell when dipped in acid and base.
(a) Onion Extracts

  • Retains its smell in acid and loses in base.  

(b) Vanilla Extracts

  • Retains its smell in acid and loses in base.  

Table: Indicator Change in acidic medium

Indicators - Acids, Bases and Salts Notes | EduRev

Table: Indicator change in basic medium
Indicators - Acids, Bases and Salts Notes | EduRev


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