In extremely acidic solutions it appears orange, but it can also be found in two other colors.
This compound constricts smooth muscle and is used as a laxative. It is used in the Kastle-Meyer test, where its oxidation is catalyzed in the presence of blood. Although this organic molecule is insoluble in water, it can be dissolved in alcohols, and is usually found in that form for laboratory use. In extremely acidic solutions it appears orange, but it can also be found in two other colors. Discovered in 1871 by Adolf von Baeyer, this indicator is produced by the condensation of an anhydride and phenol. Between pH 0 and 8.2, it appears colorless in neutral and acidic solutions. For 10 points, name this pH indicator that turns pink in basic solutions.
This compound constricts smooth muscle and is used as a laxative.
{phenolphthalein} or {HIn}