| NOUN | substance | methyl orange | an azo dye used as an acid-base indicator |
|---|
| Meaning | An azo dye used as an acid-base indicator; used for titrations involving weak bases. | |
|---|---|---|
| Broader | acid-base indicator | An indicator that changes color on going from acidic to basic solutions |
| azo dye | Any dye containing one or more azo groups | |
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