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Methyl Orange

Basic information Description References Safety Supplier Related

Methyl Orange Basic information

Product Name:
Methyl Orange
Synonyms:
  • STOCK METHYL ORANGE SOLUTION
  • SODIUM 4-(DIMETHYLAMINO)AZOBENZENE-4'-SULFONATE
  • S NO 176
  • ORANGE III
  • ORANGE ACID 52
  • P-DIMETHYLAMINOAZOBENZENESULFONIC ACID SODIUM SALT
  • P-[[P-(DIMETHYLAMINO)PHENYL]AZO]BENZENESULFONIC ACID, SODIUM SALT
  • MO
CAS:
547-58-0
MF:
C14H14N3NaO3S
MW:
327.33
EINECS:
208-925-3
Product Categories:
  • Intermediates of Dyes and Pigments
  • Organics
  • Piperazine derivates
  • Indicator Solutions
  • Indicators
  • Titration
  • Analytical Chemistry
  • Indicator (pH)
  • pH Indicators
  • Chemistry
  • Azo
Mol File:
547-58-0.mol
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Methyl Orange Chemical Properties

Melting point:
300 °C
Density 
0.987 g/mL at 25 °C
Flash point:
37 °C
storage temp. 
Store at RT.
solubility 
5g/l
Colour Index 
13025
form 
Powder/Solid
pka
3.4(at 25℃)
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.
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
Biological Applications
Detecting microorganisms; treating dermatological diseases,vaginal affections; dental materials; wound dressing materials
CAS DataBase Reference
547-58-0
EPA Substance Registry System
Methyl orange (547-58-0)
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Safety Information

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

MSDS

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Methyl Orange Usage And Synthesis

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

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.

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.

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.]

Methyl OrangeSupplier

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