Agent Name

Methyl orange

CAS Number

547-58-0

Formula

C14-H15-N3-O3-S.Na

Major Category

Dyes

Synonyms

4-Dimethylaminoazobenzene-4'-sulphonic acid sodium salt; C.I. 13025; C.I. Acid Orange 52; CI 13025; CI Acid Orange 52; Eniamethyl Orange; Gold Orange; Helianthine; Helianthine B; Kca Methyl Orange; Methyl Orange; Methyl Orange B; Methyloranz [Czech]; Orange 3; Orange III; Orange III (VAN); Oranz III [Czech]; Oranz kysela 52 [Czech]; Oranz methylova [Czech]; Sodium 4'-(dimethylamino)azobenzene-4-sulfonate; Sodium 4-(4-(dimethylamino)phenylazo)benzenesulfonate; Sodium 4-(dimethylamino)azobenzene-4'-sulfonate; Sodium p-dimethylaminoazobenzenesulfonate; Tropaeolin D; p-((p-(Dimethylamino)phenyl)azo)benzenesulfonic acid sodium; salt; Benzenesulfonic acid, 4-((4-(dimethylamino)phenyl)azo)-,; sodium salt; Benzenesulfonic acid, p-((p-(dimethylamino)phenyl)azo)-,; sodium salt; [ChemIDplus]

Category

Azo Dyes

Description

Orange powder, insoluble in water; [CAMEO]

Sources/Uses

Used as a pH indicator for the pH range of 3.1-4.4; [Ullmann]

Comments

Azo, diazo, azido compounds can detonate, especially organic azides that have been sensitized by adding metal salts or strong acids. [CAMEO]

Exposure Assessment
Vapor Pressure

1.13E-15 mm Hg

Links to Other NLM Databases
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