- Product Name:
- Methyl Orange
- 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
- Product Categories:
- Intermediates of Dyes and Pigments
- Piperazine derivates
- Indicator Solutions
- Analytical Chemistry
- Indicator (pH)
- pH Indicators
- Mol File:
Methyl Orange Chemical Properties
- Melting point:
- 300 °C
- 0.987 g/mL at 25 °C
- Flash point:
- 37 °C
- storage temp.
- Store at RT.
- Colour Index
- 3.4(at 25℃)
- Specific Gravity
- 6.5 (5g/l, H2O, 20℃)
- PH Range
- Water Solubility
- Soluble in ethanol. Partially soluble in hot water. Slightly soluble in cold water and pyrimidine. Insoluble in ether and alcohol.
- 507nm, 522nm, 464nm
- 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
- EPA Substance Registry System
- Methyl orange (547-58-0)
Methyl Orange Usage And Synthesis
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.
 Mohammed Bassim Alqaragully (2014) International Journal of Advanced Research in Chemical Science, 1, 48-59
Orange-yellow powder. Soluble in hotwater; insoluble in alcohol.
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.
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.
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.
Air & Water Reactions
Azo dyes can be explosive when suspended in air at specific concentrations. Insoluble in water.
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.
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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