acid-base indicator

Definitions of acid-base indicator
  1. noun
    an indicator that changes color on going from acidic to basic solutions
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    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
    a dye used as an acid-base indicator
    bromothymol blue, bromthymol blue
    a dye used as an acid-base indicator
    type 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
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