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ACID-BASE INDICATOR
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I. (noun)
Sense 1
Meaning:
An indicator that changes color on going from acidic to basic solutions
Classified under:
Hypernyms ("acid-base indicator" is a kind of...):
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)
Hyponyms (each of the following is a kind of "acid-base indicator"):
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)
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; bromothymol blue; bromthymol blue (a dye used as an acid-base indicator)
