7. What is litmus? What is it used for?
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Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often adsorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity.
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A dye obtained from certain lichens that are red under acidic conditions and blue under alkaline conditions is called litmus.
Litmus solution is a purple dye, which is extracted from lichen, a plant belonging to the division Thallophyta, and is commonly used as an indicator. It is used in the laboratory as indicator to test whether a given solution is acidic, basic or neutral.
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