Methyl orange, pure indicator

Supplier: Thermo Scientific
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Synonyms: 4-((4-(Dimethylamino)phenyl)diazenyl)benzenesulphonic acid, sodium saltMethyl orange sodium saltHelianthine

ACRO151421000EA 29.2 GBP
ACRO151421000 ACRO151425000
Methyl orange, pure indicator
Methyl orange
Formula: C₁₄H₁₄N₃NaO₃S
MW: 327.34 g/mol
Boiling Pt: ∼90 °C (1013 hPa)
Melting Pt: >300 °C
Storage Temperature: Ambient
MDL Number: MFCD00007502
CAS Number: 547-58-0
EINECS: 208-925-3
UN: 3143
ADR: 6.1,III
Merck Index: 13,06127

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Specification Test Results

Appearance Orange Crystalline powder
Infrared spectrum Conforms
Solubility (0.1 % in water) Clear
UV Lambda max 461 to 469 nm (in 0.01N NaOH)
Visual transition interval from pH 3.2 (pink or red)to pH 4.4 (yellow-orange)

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