Question

those bases which doesn't turns red to blue.



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Answer 1

Answer:

The main use of litmus is to test whether a solution is acidic or basic. 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.

The color of a red litmus paper remains the same under acidic conditions and turns blue under basic conditions. Substances that turn red litmus paper blue include baking soda, lime, ammonia, household cleaners and human blood.

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Answer 2

Answer:

Dry Ammonia

Explanation:

Dry ammonia has no action on litmus paper, but a solution of ammonia in water turns red litmus paper blue. Why? Dry ammonia does not liberate any ions like OH− as it is not in contact with water, thereby has no action on litmus paper.