Question

Can anyone answer me how litmus is changed from blue to red.

Answer 1

Answer:

Explanation:

Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic (i.e. alkaline) conditions. The pigment in blue litmus reacts with H+ ions and changes chemically so the bonds are 'tuned' to reflect a longer wavelength of light to appear red to our eyes.

Answer 2

Answer:

when acid is added in litmus it turns from blue to red.