Methyl orange , IND , 547-58-0

Synonym(s):
4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt;4-Dimethylaminoazobenzene-4′-sulfonic acid sodium salt, Gold orange, Helianthine, Orange III;Acid Orange 52;Helianthin;Orange III

CAS NO.：547-58-0

Empirical Formula: C14H14N3NaO3S

Molecular Weight: 327.33

MDL number: MFCD00007502

EINECS: 208-925-3

PRODUCT Properties

• Melting point: 300 °C
• Density: 0.987 g/mL at 25 °C
• Flash point: 37 °C
• storage temp.: Store at +5°C to +30°C.
• solubility: 5g/l
• Colour Index: 13025
• form: Powder/Solid
• pka: 3.4(at 25℃)
• color: Yellow-Orange
• Specific Gravity: 0.987
• Odor: Odorless
• PH: 6.5 (5g/l, H2O, 20℃)
• PH Range: 3.1(Red)-4.4(Orange)
• Water Solubility: Soluble in ethanol. Partially soluble in hot water. Slightly soluble in cold water and pyrimidine. Insoluble in ether and alcohol.
• λmax: 507nm, 522nm, 464nm
• Merck: 14,6105
• BRN: 4732884
• Stability: Stable. Incompatible with strong oxidizing agents.
• Biological Applications: Detecting microorganisms; treating dermatological diseases,vaginal affections; dental materials; wound dressing materials
• Major Application: Liquid crystals, thin films, sensors, sol-gel matrix, waveguides, host-guest chemistry, display device, corrosion inhibitor, glass coatings, paints, wound dressing materials, pharmaceuticals, dental materials, measuring nucleic acid

Description and Uses

Methyl orange is a pH indicator frequently used in titrations, also used for histological microscopy.

Safety

• Symbol(GHS): GHS06
• Signal word: Danger
• Hazard statements: H301
• Precautionary statements: P264-P270-P301+P310-P405-P501
• Hazard Codes: T
• Risk Statements: 25-10
• Safety Statements: 45-24/25-16-36/37/39
• RIDADR: UN 3143 6.1/PG 3
• WGK Germany: 3
• RTECS: DB6327000
• TSCA: Yes
• HazardClass: 6.1
• PackingGroup: III
• HS Code: 29270000
• Toxicity: LD50 orally in Rabbit: 60 mg/kg