Blue litmus paper turns red under acidic conditions, that happens when pH of the solution goes below 4.5. Litmus paper is one of the oldest pH indicator, used to test materials for acidity.
Blue litmus does not change color under alkakine conditions, while red litmus paper does not change color under acidic conditions. Neutral litmus paper is purplish in color.
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Chemistry, 22.06.2019 06:00
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