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Universal Indicator Definition

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Definition: A universal indicator is a blend of pH indicator solutions designed to identify pH of a solution over a wide range of values.

Color change is used to identify pH values. The most common universal indicators are:

red 0 ≥ pH ≥ 3
yellow 3 ≥ pH ≥ 6
green 7
blue 8 ≥ pH ≥ 11
purple 11 ≥ pH ≥ 14

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