Methyl orange , 96% , 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

Update time: 2022-07-08

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

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