Acid orange 5

From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Acid orange 5
Acid orange 5.svg
Names
IUPAC name
Sodium 4-[(E)-(4-anilinophenyl)diazenyl]benzenesulfonate
Other names
Fast yellow; Tropaeolin OO
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.008.248
Properties
C18H14N3NaO3S
Molar mass 375.38 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Tropaeolin OO (pH indicator)
below pH 1.4 above pH 3.2
1.4 3.2

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]

References[edit]

  1. ^ Beilstein 16 II 171.