What is limus paper and
why is it used
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Litmus paper is an indicator. It is used to indicate whether a given solution/substance is an acid or a base.
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The main use of litmus is to test whether a solution is acidic or basic. Light-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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