Английская Википедия:Acid orange 5
Материал из Онлайн справочника
Acid orange 5 is a compound with formula Na(C6H5NHC6H4N=NC6H4SO3). It is an azo dye. It is also used as a pH indicator; it is red in pH under 1.4, orange-yellow in pH over 3.2.[1]
Preparation
Acid orange 5 may be prepared by diazotization of sulfanilic acid, followed by reaction with diphenylamine:
References
- ↑ Beilstein 16 II 171.