Key Documents

View All Documentation

114510

Methyl Orange

Name: Methyl Orange
Brand: SIAL

ACS reagent, Dye content 85 %

Synonym(s):

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

Select a Size

Change View

About This Item

Empirical Formula (Hill Notation):

C₁₄H₁₄N₃NaO₃S

CAS Number:

547-58-0

Molecular Weight:

327.33

NACRES:

NA.47

PubChem Substance ID:

24847177

UNSPSC Code:

12171500

EC Number:

208-925-3

MDL number:

MFCD00007502

Beilstein/REAXYS Number:

4732884

Colour Index Number:

13025

Technical Service

Need help? Our team of experienced scientists is here for you.

Let Us Assist

Properties

grade

ACS reagent

Quality Segment

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

λ_max

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

Description

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.

Still not finding the right product?

Explore all of our products under Methyl Orange

pictograms

GHS06

signalword

Danger

hcodes

H301

pcodes

P301 + P330 + P331 + P310

Hazard Classifications

Acute Tox. 3 Oral

Storage Class

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