acid-base indicator

Noun
  1. An indicator that changes color on going from acidic to basic solutions (synset 114633376)
    is a 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
    subtypes:
    • 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

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