acid-base indicator
English Thesaurus
1. an indicator that changes color on going from acidic to basic solutions (noun.substance)
| hypernym | : | indicator, |
| definition | : | (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 (noun.substance) |
| hyponym | : | phenolphthalein, |
| definition | : | 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 (noun.artifact) |
| hyponym | : | congo red, |
| definition | : | a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions) (noun.substance) |
| hyponym | : | methyl orange, |
| definition | : | an azo dye used as an acid-base indicator; used for titrations involving weak bases (noun.substance) |
| hyponym | : | litmus, litmus test, |
| definition | : | 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 (noun.substance) |
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