| acid-base indicator n. A substance that indicates the degree of acidity or basicity of a solution through characteristic color changes. |
| acid-base indicator A substance, such as litmus paper, that indicates the degree of acidity or basicity of a solution through characteristic color changes. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  acid-base indicator - an indicator that changes color on going from acidic to basic solutionsphenolphthalein - 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 |
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