Merck 101322 0025 Methyl Orange (C.i.13025) indicator Acs 25 GR.

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Description
Catalogue Number	101322
Synonyms	4-Dimethylaminoazobenzene-4'-sulfonic acid sodium salt, Gold orange, Helianthine, Orange III

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Product Information
CAS number	547-58-0
EC number	208-925-3
Grade	ACS,Reag. Ph Eur
Hill Formula	C₁₄H₁₄N₃NaO₃S
Molar Mass	327.34 g/mol
HS Code	2927 00 29
Structure formula Image
Quality Level	MQ200

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Physicochemical Information
Melting Point	>300 °C
pH value	6.5 (5 g/l, H₂O, 20 °C)
Bulk density	200 - 400 kg/m3
Solubility	5 g/l

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Toxicological Information
LD 50 oral	LD50 Rat 60 mg/kg

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Safety Information according to GHS
Hazard Pictogram(s)	\n
Hazard Statement(s)	H301: Toxic if swallowed.
Precautionary Statement(s)	P264: Wash skin thoroughly after handling.\nP270: Do not eat, drink or smoke when using this product.\nP301 + P310: IF SWALLOWED: Immediately call a POISON CENTER/doctor.\nP405: Store locked up.\nP501: Dispose of contents/ container to an approved waste disposal plant.
Signal Word	Danger
Storage class	6.1C Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects
WGK	WGK 3 highly hazardous to water
Disposal	9\nCarcinogenic 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).

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Safety Information
Categories of danger	toxic

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Storage and Shipping Information
Storage	Store at +2°C to +30°C.

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Transport Information
Declaration (railroad and road) ADR, RID	UN 3143 , 6.1, III
Declaration (transport by air) IATA-DGR	UN 3143 , 6.1, III
Declaration (transport by sea) IMDG-Code	UN 3143 , 6.1, III

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Specifications
Identity (UV/VIS-Spectrum)	passes test
Clarity of solution (1 g/l; water)	passes test
Transition range	pH 3.1 - pH 4.4 pink - orange yellow
Absorption maximum λ 1 max. (buffer pH 3.1)	501 - 505 nm
Absorption maximum λ 2 max. (buffer pH 4.4)	466 - 471 nm
Spec. Absorptivity A 1%/1cm (λ 1 max.; 0.01 g/l; buffer pH 3.1; calc. on dried substances)	1000 - 1150
Spec. Absorptivity A 1%/1cm (λ 2 max.; 0.01 g/l; buffer pH 4.4; calc. on dried substances)	730 - 850
Loss on drying (110 °C)	≤ 5 %
Transition range (according to ACS)	passes test
Sensitivity test	passes test