what is litmus paper
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The main use of litmus is to test whether a solution is acidic or basic. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline conditions, with the color change occurring over the pH range 4.5–8.3 at 25 °C (77 °F). Neutral litmus paper is purple.
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Answer: it is a chemical indicator
Explanation:- it is a purple coloured paper made from the extract of lichen and is used to test acidic or basic properties of substances,i.e., know which one is acid and which is base.
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