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O-methylphenolphthalein, also known as o-methylphenolphthalein (c22h18o4mol346.38), is a white or yellow powder, easily soluble in ethanol and ether; insoluble in water, soluble in dilute alkali and blue, with a pH value of 8.2-9.8 (color from colorless to red); the maximum absorption peak is 566 (381) mm. O-cresol phthalein complex is not only a metal complex indicator, but also an acid-base indicator. Chelate with calcium and magnesium in acid solution to form purplish red chelate.
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