1. An indicator is a dye that changes colour when it is put into acid or a base. An indicator gives different colours in acid and base. Thus an indicator tells us if the given substance is an acid or base by changing its colour. The three common indicators are: Litmus, Methyl orange, phenolphthalein.
2. The most common indicators used for testing acids and bases in the laboratory is litmus that is a natural indicator. Litmus paper is obtained from a plant called as lichens(division thallophyta). It can be used as litmus solution or litmus paper. Litmus can be blue litmus and red litmus. Acids turn blue litmus red and bases turn blue litmus red.
2. The most common indicators used for testing acids and bases in the laboratory is litmus that is a natural indicator. Litmus paper is obtained from a plant called as lichens(division thallophyta). It can be used as litmus solution or litmus paper. Litmus can be blue litmus and red litmus. Acids turn blue litmus red and bases turn blue litmus red.
