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Ethyl orange is an organic compound of a dye which behaves like a pH indicator , IUPAC name 4- [4- (diethylamino) phenyl] diazenylbenzenesulfonic acid; sodium , CAS number 62758-12-7
E 1630 (OTTO) Ethyl orange sodium salt Cas 62758- 12-7 - used as a pH indicator in various titrations.