Question

what are the changes you observe in litmus paper with acids and bases​

Answer 1

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.

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Answer 2

when you dip litmus paper in acid it's colour changes into blue