Английская Википедия:Acid orange 5

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Шаблон:Chembox

Шаблон:PH indicator template

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:

Шаблон:Chem2

References

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  1. Beilstein 16 II 171.