acid-base indicator

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Noun1.acid-base indicator - an indicator that changes color on going from acidic to basic solutionsacid-base indicator - an indicator that changes color on going from acidic to basic solutions
phenolphthalein - 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
congo red - a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
methyl orange - an azo dye used as an acid-base indicator; used for titrations involving weak bases
indicator - (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction
litmus, litmus test - a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
bromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthalein - a dye used as an acid-base indicator
bromothymol blue, bromthymol blue - a dye used as an acid-base indicator
References in periodicals archive ?
It is an acid-base indicator whose useful range lies between pH 3.
One strategy involves using an acid-base indicator such as thymolphthalein, which has a deep blue color in an alkaline solution but is colorless in acidic conditions.
In a quality-control laboratory, BTJA could be used to identify survivors of inadequately canned foods for aerobic or anaerobic plate count as a MPN procedure due to its acid-base indicator and selectivity spore-formers of interest in food quality monitoring and research.

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