Question

what is blue litmus paper?​

Answer 1

Answer:

Litmus paper is filter paper which has been treated with a natural water-soluble dye obtained from lichens. ... Blue litmus paper turns red under acidic conditions (pH below 4.5) while red litmus paper turns blue under alkaline conditions (pH above 8.3).

Explanation:

It is used to test for acids and will turn a shade of red when it comes in contact with an acidic solution. Neutral litmus paper is purple and will change color to red or blue depending on if the solution being tested is acidic or alkaline.

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Answer 2

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.