The indicator molecule must not react with the substance being titrated. To minimize errors, the indicator should have a pKin that is within one pH unit of the expected pH at the equivalence point of the titration. Figure \(\PageIndex{1}\): Naturally Occurring pH Indicators in Red Cabbage Juice. Image curtesty of Wikipedia.. A Universal indicator is a mixture of several indicators that can provide a continuous color change over a range of pH values, typically from about pH 2 to pH 10. Universal indicator paper is made from absorbent paper that has been impregnated with universal indicator.
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/testing-solutions-for-ph-in-multiwell-plates-632210539-59e344f3c412440010958389-5c49fb16c9e77c0001e5c485.jpg "What Is a pH Indicator? Definition and Examples")
What Is a pH Indicator? Definition and Examples
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Examples of pH Indicators . Methyl red is a pH indicator used to identify pH values between 4.4 and 6.2. At low pH (4.4 and lower) the indicator solution is red. At high pH (6.2 and above) the color is yellow. Between pH 4.4 and 6.2, the indicator solution is orange. Bromocresol green is a pH indicator used to identify pH values between 3.8 and.. The pH scale measures how strongly acidic or alkaline a solution is using a set of values from pH 0 to pH 14. When pure water is dropped into a solution of universal indicator, the indicator stays.
