Methyl Orange CAS 547-58-0

Introduction：Basic information about Methyl Orange CAS 547-58-0, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.

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;bulk reagents
• Mol File: 547-58-0.mol

Methyl Orange Chemical Properties

• Melting point: 300 °C
• bulk density: 200-400kg/m3
• density: 0.987 g/mL at 25 °C
• Fp: 37 °C
• storage temp.: Store at +5°C to +30°C.
• solubility: 5g/l
• pka: 3.4(at 25℃)
• form: Powder/Solid
• 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
• 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+;
• InChIKey: STZCRXQWRGQSJD-GEEYTBSJSA-M
• SMILES: [Na+].CN(C)c1ccc(cc1)\N=N\c2ccc(cc2)S([O-])(=O)=O
• CAS DataBase Reference: 547-58-0
• EPA Substance Registry System: Methyl orange (547-58-0)

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: TSCA listed
• HazardClass: 6.1
• PackingGroup: III
• HS Code: 29270000
• Storage Class: 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects
• Hazard Classifications: Acute Tox. 3 Oral
• Hazardous Substances Data: 547-58-0(Hazardous Substances Data)
• Toxicity: LD50 orally in Rabbit: 60 mg/kg

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.
Uses	Methyl orange is a pH indicator frequently used in titrations, also used for histological microscopy.
Definition	An acid–base indicatorthat is red in solutions below a pH of 3 andyellow above a pH of 4.4. As the transitionrange is clearly on the acid side, methyl orangeis suitable for the titration of an acidwith a moderately weak base, such assodium 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: Toluene-->N-Methylaniline-->Sulfanilic acid-->Sulfamic acid-->4-Aminobenzoic acid-->Sulfanilic acid-->N,N-Dimethylaniline
• Preparation Products: N,N-Dimethyl-1,4-phenylenediamine-->Potassium tetrafluoroborate-->SODIUM CYCLOPENTADIENIDE-->4-Amino-benzenesulfonic acid monosodium salt