cresol red

cresol red
An acid-base indicator with a pK value of 8.3; yellow at pH values below 7.4, red above 9.0.

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an indicator, ortho-cresol-sulfonphthalein, used in the determination of the hydrogen ion concentration. It has a pH range of 7.2 to 8.8, being yellow at 7.2 and red at 8.8.

Medical dictionary. 2011.

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