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LC3851 Methyl orange (C.I. 13025)

indicator ACS,Reag. Ph Eur


Order number Packaging Quantity Price €
AC30851 Glass bottle 25 g 23.4
AC30851 Glass bottle 100 g 38.25
AC30851 Metal can 1 kg 262.8


Product information
Grade ACS,Reag. Ph Eur
Synonyms 4-Dimethylaminoazobenzene-4′-sulfonic acid sodium salt, Gold orange, Helianthine, Orange III
Hill Formula C14H14N3NaO3S
HS Code 2927 00 00
EC number 208-925-3
Molar mass 327.34 g/mol
CAS number 547-58-0


Chemical and physical data
Solubility 5 g/l (20 °C)
Melting point >300 °C
Molar mass 327.34 g/mol
Bulk density 200 – 400 kg/m3
pH value 6.5 (5 g/l, H2O, 20 °C)


Safety information according to GHS
Hazard Statement(s) H301: Toxic if swallowed.
Signal Word Danger
Hazard Pictogram(s)
Storage class Combustible substances, toxic
WGK WGK 3 highly water endangering
Disposal 9
Carcinogenic compounds and flammable compounds labelled “Highly toxic” or “Toxic”: container F. Alkyl sulfates are carcinogenic; Take particular care to avoid inhalation and skin contact. To neutralize alkyl sulfates, add dropwise (from a dropping funnel) to concentrated ice-cool Ammonia solution (Cat.No. 105426) with vigorous stirring. Before placing in container D, check the pH with pH Universal indicator strips (Cat.No. 109535).


Safety information
R Phrase R 25
Toxic if swallowed.
S Phrase S 37-45
Wear suitable gloves.In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).
Categories of danger toxic
Hazard Symbol Toxic


Transport information
Declaration (transport by sea) IMDG-Code UN 2811 TOXIC SOLID, ORGANIC, N.O.S.(METHYL ORANGE), 6.1, III
Declaration (transport by air) IATA-DGR UN 2811 TOXIC SOLID, ORGANIC, N.O.S.(METHYL ORANGE), 6.1, III


Toxicological data
LD 50 oral LD50 rat 60 mg/kg


Transition range pH 3.1 – pH 4.4
pink – orange yellow
Appearance of solution passes test
Loss on drying (110 °C) ≤ 5 %
Transition range
– according to ACS
passes test
Sensitivity test passes test


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