acid-base indicator
61thymol — A phenol present in the volatile oil of Thymus vulgaris (thyme), Monarda punctata (horsemint), and other volatile oils; used externally and internally as an antiseptic, as a deodorizer of offensive discharges, and as a specific for… …
62litmus paper — n paper colored with litmus and used as an acid base indicator * * * bibulous paper impregnated with a solution of litmus, dried, and cut into strips. If slightly alkaline, the paper is blue and is used as a test for acids, which turn it red; if… …
63phenolphthalein — Pale yellow powder; forms an almost colorless solution in neutral or acid solution in presence of alkali, but colorless in the presence of large amount of alkali. Used in dyes, acid base indicator and in medicine as a laxative …
64Congo red — n. a sodium salt, C32H22O6N6S2Na2, used for dyeing wool and cotton and as an acid base indicator: it becomes blue in an acid solution and remains red in an alkaline or neutral solution …
65bromocresol green — | ̷ ̷ ̷ ̷ at bromo +... noun also bromcresol green Etymology: International Scientific Vocabulary brom + cresol : a brominated acid dye of the sulfonephthalein series derived from meta cresol that is obtained as a yellowish crystalline powder and …
66bromocresol purple — noun also bromcresol purple : a brominated acid dye of the sulfonephthalein series derived from ortho cresol that is obtained as a pinkish crystalline powder and is used as an acid base indicator …
67methyl orange — noun An azo dye used as an acid base indicator for titrations involving a weak base …
68litmus — [lit′məs] n. [ON litmose, lichen used in dyeing < litr, color (akin to Goth wlits, face < IE * witu , appearance < base * wel , to see > L voltus, expression, Welsh gweled, to see) + mosi, MOSS] a purple coloring matter obtained from… …
69bromthymol blue — noun Date: 1920 a dye derived from thymol that is an acid base indicator called also bro•mo•thy•mol blue …
70neutral red — noun Date: 1890 a basic dye used chiefly as a biological stain and acid base indicator …
