Merck
All Photos(1)

1.01322

Supelco

Methyl orange (C.I. 13025)

indicator ACS,Reag. Ph Eur

Synonym(s):
Methyl orange (C.I. 13025), 4-Dimethylaminoazobenzene-4′-sulfonic acid sodium salt, Gold orange, Helianthine, Orange III
Empirical Formula (Hill Notation):
C14H14N3NaO3S
CAS Number:
Molecular Weight:
327.33
MDL number:
EC Index Number:
208-925-3

Quality Level

grade

ACS reagent

Agency

reag. Ph. Eur.

form

solid

potency

60 mg/kg LD50, oral (Rat)

loss

≤5% loss on drying, 110°C

pH

6.5 (20 °C, 5 g/L in H2O)

mp

>300 °C

bulk density

200‑400 kg/m3

storage temp.

2-30°C

InChI

1S/C14H15N3O3S/c1-17(2)13-7-3-11(4-8-13)15-16-12-5-9-14(10-6-12)21(18,19)20/h3-10H,1-2H3,(H,18,19,20)/p-1

InChI key

IETWCRRCPURZOC-UHFFFAOYSA-M

Analysis Note

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

Pictograms

Skull and crossbones

Signal Word

Danger

Hazard Statements

Hazard Classifications

Acute Tox. 3 Oral

Storage Class Code

6.1C - Combustible, acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

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