a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8
phenolphthalein详细解释
phe.nol.phthal.ein n.（名词）A white or pale yellow crystalline powder, C20H 4O 4, used as an acid-base indicator, in making dyes, and in medicine as a laxative. 苯酚酞：一种白色或淡黄色的晶体粉末，C20H 4O 4，用作酸性指示剂，用于制染料，并在医学上用作一种轻泻剂
