Description References
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Methyl Orange

Description References
Product Name
Methyl Orange
CAS No.
547-58-0
Chemical Name
Methyl Orange
Synonyms
MO;HELIANTHIN;Methyl Orange solution;sodiuM (E)-4-((4-(diMethylaMino)phenyl)diazenyl)benzenesulfonate;orang;orange3;CI 13025;S NO 176;oranziii;BETZ 0211
CBNumber
CB2264381
Molecular Formula
C14H14N3NaO3S
Formula Weight
327.33
MOL File
547-58-0.mol
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Methyl Orange Property

Melting point:
300 °C
Density 
0.987 g/mL at 25 °C
bulk density
200-400kg/m3
Flash point:
37 °C
storage temp. 
Store at +5°C to +30°C.
solubility 
5g/l
form 
Powder/Solid
pka
3.4(at 25℃)
Colour Index 
13025
color 
Yellow-Orange
Specific Gravity
0.987
Odor
Odorless
PH
6.5 (5g/l, H2O, 20℃)
PH Range
3.1(Red)-4.4(Orange)
Water Solubility 
Soluble in ethanol. Partially soluble in hot water. Slightly soluble in cold water and pyrimidine. Insoluble in ether and alcohol.
λmax
507nm, 522nm, 464nm
Merck 
14,6105
BRN 
4732884
Stability:
Stable. Incompatible with strong oxidizing agents.
Biological Applications
Detecting microorganisms; treating dermatological diseases,vaginal affections; dental materials; wound dressing materials
Major Application
Liquid crystals, thin films, sensors, sol-gel matrix, waveguides, host-guest chemistry, display device, corrosion inhibitor, glass coatings, paints, wound dressing materials, pharmaceuticals, dental materials, measuring nucleic acid
CAS DataBase Reference
547-58-0
EPA Substance Registry System
Methyl orange (547-58-0)
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Safety

Hazard Codes 
T
Risk Statements 
25-10
Safety Statements 
45-24/25-16-36/37/39
RIDADR 
UN 3143 6.1/PG 3
WGK Germany 
3
RTECS 
DB6327000
TSCA 
Yes
HazardClass 
6.1
PackingGroup 
III
HS Code 
29270000
Hazardous Substances Data
547-58-0(Hazardous Substances Data)
Toxicity
LD50 orally in Rabbit: 60 mg/kg
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H301Toxic if swalloed

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P301+P310IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P405Store locked up.

P501Dispose of contents/container to..…

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N-Bromosuccinimide Price

Sigma-Aldrich
Product number
68250
Product name
Methyl Orange
Purity
for microscopy (Hist.), indicator (pH 3.0-4.4)
Packaging
25g
Price
$28
Updated
2025/07/31
Sigma-Aldrich
Product number
68250
Product name
Methyl Orange
Purity
for microscopy (Hist.), indicator (pH 3.0-4.4)
Packaging
100g
Price
$46.6
Updated
2025/07/31
Sigma-Aldrich
Product number
68250
Product name
Methyl Orange
Purity
for microscopy (Hist.), indicator (pH 3.0-4.4)
Packaging
500g
Price
$163
Updated
2025/07/31
Sigma-Aldrich
Product number
114510
Product name
Methyl Orange
Purity
ACS reagent, Dye content 85%
Packaging
25g
Price
$55.9
Updated
2025/07/31
Sigma-Aldrich
Product number
114510
Product name
Methyl Orange
Purity
ACS reagent, Dye content 85%
Packaging
100g
Price
$78.8
Updated
2025/07/31
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Methyl Orange Chemical Properties,Usage,Production

Description

Methyl orange is an orange, azoic dye. It has a transition range from 3.1 to 4.4. Methyl orange does not have a full spectrum of color change, but has a sharper end point. Methyl orange shows red color in acidic medium (pH < 3.1) and yellow color in basic medium (pH > 4.4). It is used as a pH-indicator in 0.1% aqueous solution for the titration of mineral acids (not organic acids) and strong bases. Methyl orange is also used in dyeing and printing textiles as a dyestuff.

References

[1] https://en.wikipedia.org/wiki/Methyl_orange
[2] Mohammed Bassim Alqaragully (2014) International Journal of Advanced Research in Chemical Science, 1, 48-59

Chemical Properties

Orange-yellow powder. Soluble in hotwater; insoluble in alcohol.

Uses

Methyl orange is a pH indicator frequently used in titrations, also used for histological microscopy.

Uses

As indicator in 0.1% aqueous solution. pH: 3.1 red, 4.4 yellow. Employed for titrating most mineral acids, strong bases, estimating alkalinity of waters; useless for organic acids. In dyeing and printing of textiles.

Definition

An acid–base indicator that is red in solutions below a pH of 3 and yellow above a pH of 4.4. As the transition range is clearly on the acid side, methyl orange is suitable for the titration of an acid with a moderately weak base, such as sodium carbonate.

Definition

methyl orange: An organic dyeused as an acid–base indicator. Itchanges from red below pH 3.1 toyellow above pH 4.4 (at 25°C) and isused for titrations involving weakbases.

Preparation

4-Aminobenzenesulfonic acid diazo, and N,N-dimethylaniline coupling.

General Description

Orange powder.

Air & Water Reactions

Azo dyes can be explosive when suspended in air at specific concentrations. Insoluble in water.

Reactivity Profile

Methyl Orange is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides.

Biological Activity

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

Purification Methods

Recrystallise it twice from hot water, then wash it with a little EtOH followed by diethyl ether. It is an indicator: pH 3.1 (red) and pH 4.4 (yellow). [Beilstein 16 IV 510.]

Properties and Applications

orange. The strong sulfuric acid for green light yellow, diluted into red orange. The dye solution to join strong hydrochloric acid for orange red; Add thick sodium hydroxide solution for green light yellow.

Standard Light Fastness Soaping Persperation Fastness Oxygen bleaching Fastness to seawater
Fading Stain Fading Stain Fading Stain
ISO
AATCC

Methyl Orange Preparation Products And Raw materials

Raw materials

Sulfanilic acid N-Methylaniline 4-Aminobenzoic acid Toluene Sulfamic acid

Preparation Products

Potassium tetrafluoroborate SODIUM CYCLOPENTADIENIDE N,N-Dimethyl-1,4-phenylenediamine
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View Lastest Price from Methyl Orange manufacturers

Hefei Lbao Physical & Chemical Science Co.,Ltd
Product
Methyl Orange 547-58-0
Price
US $0.00/kg
Min. Order
1kg
Purity
98%
Supply Ability
Customise
Release date
2025-10-31
Hebei Chuanghai Biotechnology Co., Ltd
Product
Methyl Orange 547-58-0
Price
US $25.00/ASSAYS
Min. Order
100ASSAYS
Purity
99.5%
Supply Ability
100 mt
Release date
2024-11-19
Hebei Zhuanglai Chemical Trading Co.,Ltd
Product
Methyl Orange 547-58-0
Price
US $10.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
20ton
Release date
2024-05-24

547-58-0, Methyl OrangeRelated Search:

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