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68250

Sigma-Aldrich

Methyl Orange

for microscopy (Hist.), indicator (pH 3.0-4.4)

Synonym(s):

4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Helianthin, Orange III

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About This Item

Empirical Formula (Hill Notation):
C14H14N3NaO3S
CAS Number:
547-58-0
Molecular Weight:
327.33
Colour Index Number:
13025
Beilstein:
4732884
EC Number:
208-925-3
MDL number:
MFCD00007502
UNSPSC Code:
12171500
PubChem Substance ID:
329760496
NACRES:
MA.02

grade

for microscopy (Hist.)
indicator (pH 3.0-4.4)

Quality Level

200

form

powder

technique(s)

titration: suitable

pH

3.0-4.4, pink to yellow

solubility

methanol: water (1:1): 0.1 g/10 mL, orange to very deep orange

λmax

501.4 nm in H2O (acidified)

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

room temp

SMILES string

[Na+].CN(C)c1ccc(cc1)\N=N\c2ccc(cc2)S([O-])(=O)=O

InChI

1S/C14H15N3O3S.Na/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);/q;+1/p-1/b16-15+;

InChI key

STZCRXQWRGQSJD-GEEYTBSJSA-M

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General description

Methyl orange is an orange colored synthetic dye, which undergoes a change in color depending on the pH of the solution. It basically develops a red color in acidic solution and yellow color in basic solution.

Pictograms

Skull and crossbones
GHS06

Signal Word

Danger

Hazard Statements

H301

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

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
BCCL5315
BCCK1373
BCCH2657
BCCC8847
BCCB7429

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Longman Science Chemistry 10 (2008)
Science for Tenth Class Part 2 Chemistry null
Ya Yang et al.
Nano letters, 13(2), 803-808 (2013-01-18)
In general, methyl orange (MO) can be degraded by an electrocatalytic oxidation process driven by a power source due to the generation of superoxidative hydroxyl radical on the anode. Here, we report a hybrid energy cell that is used for
Bin Cai et al.
Nanoscale, 5(5), 1910-1916 (2013-01-29)
Zero bandgap and water soluble sulfonated graphene (SGE) has been introduced into an n-type semiconductor photocatalytic system to fabricate a Ag@AgBr/SGE composite photocatalyst. Due to its unique conduction and valence band dispersion and low Fermi level, SGE serves as an
Jing Cao et al.
Journal of hazardous materials, 239-240, 316-324 (2012-09-29)
Novel p-n junction photocatalysts BiOI/(BiO)2CO3 with different contents of BiOI were in situ synthesized by etching (BiO)2CO3 precursor with hydroiodic acid (HI) solution. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectrometry (FT-IR), energy-dispersive spectroscopy (EDS)
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