Question

Question: Why does the acid turn blue litmus red?

CLASS 10
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Answer 1

Answer:

Explanation:

Blue litmus paper turns red in acid.

Pigment in blue litmus paper reacts with  H +  ions. It changes chemically so the bonds are tuned to reflect a longer wavelength of light to appear red to our eyes. The pigment is absorbing the blue to green wavelengths when it reacts with the free hydrogen ions in acids.

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