Colourful Chemistry: Chemistry of UNIVERSAL INDICATOR

| July 7, 2017

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By definition, an indicator is a substance that changes color in different pH environments. Universal indicator is a brown-colored solution—containing a mixture of indicators—that can be added to any substance to determine its pH. Like all indicators, the universal indicator changes color in different pH environments. At low pH, it appears red, and at high pH, it appears blue or violet. At neutral pH, it appears green. The universal indicator can form a continuous spectrum of colors that give an approximate reading of the concentration of protons in a sample.

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