Skip to Content
Merck
CN
All Photos(4)

Documents

114510

Sigma-Aldrich

Methyl Orange

ACS reagent, Dye content 85 %

Sign Into View Organizational & Contract Pricing
All Photos(4)
Synonym(s):
4-[4-(Dimethylamino)phenylazo]benzenesulfonic acid sodium salt, Acid Orange 52, Helianthin, Orange III
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:
24847177
NACRES:
NA.47

grade

ACS reagent

Quality Level

200

form

powder

composition

Dye content, 85%

technique(s)

titration: suitable

color

orange

pH

3.0-4.4, pink to yellow

visual transition interval

3.2-4.4, red to yellow

mp

>300 °C

λmax

505 nm

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

Looking for similar products? Visit Product Comparison Guide

Related Categories

General description

Methyl orange (C.I. 13025) is the sodium salt of p-dimethylaminoazobenzenesulfonic acid.It is an orange-colored synthetic dye, which changes color depending on the pH of the solution. It develops a red color in acidic solution and yellow color in basic solution.

Application

Methyl orange is used as a-
  • pH indicator in the cell sap
  • counterstain to crystal violet in staining pollen tubes
  • component of a polychrome histological stain
  • solution indicator, such as in assays of oxalic and malonic acids
  • in other biomedical applications that include use in film dosimeters and as a reagent for the assay of bromide ions.

Biochem/physiol Actions

Methyl Orange is an azo dye which works as a pH indicator.

Pictograms

Skull and crossbones
GHS06

Signal Word

Danger

Hazard Statements

H301

Precautionary Statements

P301 + P330 + P331 + P310

Hazard Classifications

Acute Tox. 3 Oral

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library

Somayeh Mirsadeghi et al.
Journal of environmental management, 270, 110831-110831 (2020-06-09)
A simple biogenic approach for synthesis of Fe3O4/Au nanocomposite with 31 nm size using aqueous extract of Carum carvi L. seeds has been reported. Phytochemicals of Carum carvi L. seeds extract play three roles, including reducing, capping, and stabilizing agents during
Encapsulation of methyl orange pH-indicator into a sol-gel matrix.
Zaggout FR, et al.
Materials Letters, 59, 2928-2931 (2005)
Characterization of methyl orange and its photocatalytic degradation products by HPLC/UV?VIS diode array and atmospheric pressure ionization quadrupole ion trap mass spectrometry.
Baiocchi C, et al.
International Journal of Mass Spectrometry, 214, 247-256 (2002)
P Kumar et al.
Colloids and surfaces. B, Biointerfaces, 103, 658-661 (2012-12-26)
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
Tarek Alammar et al.
Nanoscale, 5(17), 8045-8055 (2013-07-23)
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.
View All Related Papers

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service