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Methyl Orange

Methyl Orange Structure
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
Molecular Weight:
327.33
MOL File:
547-58-0.mol
Modify Date:
2024/6/18 9:56:13

Methyl Orange Properties

Melting point 300 °C
Density 0.987 g/mL at 25 °C
Flash point 37 °C
storage temp. Store at +5°C to +30°C.
solubility 5g/l
Colour Index 13025
form Powder/Solid
pka 3.4(at 25℃)
Specific Gravity 0.987
color Yellow-Orange
PH 6.5 (5g/l, H2O, 20℃)
Odor Odorless
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)

SAFETY

Risk and Safety Statements

Symbol(GHS) 
GHS06
Signal word  Danger
Hazard statements  H301
Precautionary statements  P264-P270-P301+P310-P405-P501
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
Toxicity LD50 orally in Rabbit: 60 mg/kg
NFPA 704
0
0 0

Methyl Orange price More Price(21)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich(India) 68250 Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4) 547-58-0 25G ₹2468.1 2022-06-14 Buy
Sigma-Aldrich(India) 68250 Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4) 547-58-0 100G ₹3528.95 2022-06-14 Buy
Sigma-Aldrich(India) 68250 Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4) 547-58-0 500G ₹13823.53 2022-06-14 Buy
Sigma-Aldrich(India) 114510 Methyl Orange ACS reagent, Dye content 85?% 547-58-0 100G ₹4903.73 2022-06-14 Buy
Sigma-Aldrich(India) 114510 Methyl Orange ACS reagent, Dye content 85?% 547-58-0 25G ₹6116.13 2022-06-14 Buy
Product number Packaging Price Buy
68250 25G ₹2468.1 Buy
68250 100G ₹3528.95 Buy
68250 500G ₹13823.53 Buy
114510 100G ₹4903.73 Buy
114510 25G ₹6116.13 Buy

Methyl Orange Chemical Properties,Uses,Production

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.

Preparation

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

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.

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.]

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