Question

why red litmus paper turns blue ?​

Answer 1

hope it will help u

Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The conjugate base formed from the litmus acid has a blue color, so the wet red litmus paper turns blue in alkaline solution.

Answer 2

Answer:

Blue litmus paper turns red under acidic conditions whereas red litmus paper turns blue under basic or alkaline conditions.

Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The base, thus formed, is conjugated turns red litmus into blue colour in an acidic solution and the blue litmus turns into red colour in an acidic solution.