what is known as mixed indicator
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mixed indicator. [′mikst ′in·də‚kād·ər] (analytical chemistry) Color-change indicator for acid-base titration end points in which a mixture of two indicator substances is used to give sharper end-point color changes.
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Color-change indicator for acid-base titration end points in which a mixture of two indicator substances is used to give sharper end-point color changes.
For example: A mixture of 3parts of phenolphthalein and 1 part of naphtholphthalein shows a change in color from pale rose to violet at pH = 8.9. The mixed indicator is useful for the titration of phosphoric acid to diproti stage.
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