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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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P Kumar et al.
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In this paper, we report on biosynthesis of silver nanoparticles using Ulva lactuca (seaweed) at room temperature along with photocatalytic degradation of methyl orange dye. UV spectral analysis showed peak at 430 nm with special reference to the excitation of
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The phase selective synthesis of nanocrystalline TiO2, titania, in ionic liquids (ILs) is explored. The influence not only of the IL but also of the Ti-precursor, pH, and temperature is investigated. Sonochemical synthesis, microwave synthesis and conventional heating are compared.
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