HyperDic: acid-base_indicator

English > 1 sense of the expression acid-base indicator:
NOUNsubstanceacid-base indicatoran indicator that changes color on going from acidic to basic solutions
English > acid-base indicator: 1 sense > noun 1, substance
MeaningAn indicator that changes color on going from acidic to basic solutions.
Narrowerbromophenol blue, bromphenol blue, tetrabromo-phenolsulfonephthaleinA dye used as an acid-base indicator
bromothymol blue, bromthymol blueA dye used as an acid-base indicator
congo redA red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)
litmus, litmus testA coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions
methyl orangeAn azo dye used as an acid-base indicator
phenolphthaleinA laxative used in many preparations under various trade names
Broaderindicator(chemistry) a substance that changes color to indicate the presence of some ion or substance

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