Red Litmus Paper to Blue

Alkaline solutions have pH values more than 7. Unlike most organic compounds dyes possess colour because they 1 absorb light in the visible spectrum 400700 nm 2 have at least one chromophore colour-bearing group 3 have a conjugated system ie.


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A structure with alternating double and single bonds and 4 exhibit resonance of electrons which is a stabilizing force in organic compounds Abrahart 1977.

. Stomach acid turns universal indicator paper a strong red colour. Toothpaste will turn. This indicates a pH value of 0 the strongest value of acid.


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Blue Litmus Test Paper

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