Why does a basic solution turn red litmus blue?

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Why does a basic solution turn red litmus blue?

Sumit Saini 20th Apr, 2021

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Sumit Saini 20th Apr, 2021

The red litmus paper contains a weak diprotic acid. When the litmus paper is exposed to the base, hydrogen ions will combine with a base to form a conjugate base which is blue in colored complex.

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