| NOUN | substance | acid-base indicator | an indicator that changes color on going from acidic to basic solutions |
|---|
| Meaning | An indicator that changes color on going from acidic to basic solutions. | |
|---|---|---|
| Narrower | 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 | |
| congo red | A red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions) | |
| litmus, litmus test | A coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions | |
| methyl orange | An azo dye used as an acid-base indicator | |
| phenolphthalein | A laxative used in many preparations under various trade names | |
| Broader | indicator | (chemistry) a substance that changes color to indicate the presence of some ion or substance |
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