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what is the compound involved in changing of blue litmus to red litmus paper in acid

what is the compound involved in changing of blue litmus to red litmus paper in acid

Grade:6

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
An acid is defined as a substance that turns blue litmus paper to red,while base is a substance that changes red litmus paper to blue.Litmus paper is an filter paper which is treated with a natural water-soluble dye obtained from lichens which is used in laboratories to test the substances as acid or base or neutral.This litmus is an indicator made from lichens.It is a water-soluble mixture of different dye types extracted from lichens.Such plants occurs in several varieties.For ex- one variety of lichen called Rocella Tincotoria when allowed to react with substances like ammonia, lime etc. it gives a blue-color material,which is used as the coloring matter for paper,which is known as blue litmus paper and used to test acids.Another variety Orchil or cudbear is a red dye obtained from another species of lichen used to make red litmus paper which is used to test bases.

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