Methyl Orange
- CAS No.
- 547-58-0
- Chemical Name:
- Methyl Orange
- Synonyms
- MO;HELIANTHIN;orang;ORANGE III;HELIANTHINE;ORANGE ACID 52;ACID ORANGE 52;Methyl Orange solution;sodiuM (E)-4-((4-(diMethylaMino)phenyl)diazenyl)benzenesulfonate;orange3
- CBNumber:
- CB2264381
- Molecular Formula:
- C14H14N3NaO3S
- Molecular Weight:
- 328.34
- MDL Number:
- MFCD00007502
- MOL File:
- 547-58-0.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| 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 |
| 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 |
| FDA 21 CFR | 175.390 |
| Indirect Additives used in Food Contact Substances | METHYL ORANGE |
| CAS DataBase Reference | 547-58-0 |
| FDA UNII | 6B4TC34456 |
| EPA Substance Registry System | Methyl orange (547-58-0) |
| UNSPSC Code | 12352107 |
| NACRES | NA.47 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS06 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H301 | |||||||||
| Precautionary statements | P264-P270-P301+P310-P405-P501 | |||||||||
| PPE | Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges | |||||||||
| 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 |
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| Hazard Classifications | Acute Tox. 3 Oral | |||||||||
| Hazardous Substances Data | 547-58-0(Hazardous Substances Data) | |||||||||
| Toxicity | LD50 orally in Rabbit: 60 mg/kg | |||||||||
| Limited Quantities | 5.0 kg (11 lbs) (solid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (1Kg or 1L) | |||||||||
| NFPA 704 |
|
Methyl Orange price More Price(68)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 68250 | Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4) | 547-58-0 | 25g | $29.2 | 2026-04-30 | Buy |
| Sigma-Aldrich | 68250 | Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4) | 547-58-0 | 100g | $48.6 | 2026-04-30 | Buy |
| Sigma-Aldrich | 68250 | Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4) | 547-58-0 | 500g | $169 | 2026-04-30 | Buy |
| Sigma-Aldrich | 114510 | Methyl Orange ACS reagent, Dye content 85% | 547-58-0 | 25g | $97.8 | 2026-04-30 | Buy |
| Sigma-Aldrich | 114510 | Methyl Orange ACS reagent, Dye content 85% | 547-58-0 | 100g | $294 | 2026-04-30 | Buy |
Methyl Orange Chemical Properties,Uses,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
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.
Application
Methyl orange is used as pH indicator. Before using, add 0.4 g in 100 mL Ethanol (20%) or 0.04 g in 100 mL water or 0.25 g in 100 mL acetone.
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
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Shenyang Snota Biotech Co.,Ltd | +86-024-31174117 +86-18002429090 | 2193387905@qq.com | China | 103 | 58 |
| Shenyang Shengyuan chemical industry co., ltd | 13190211560 | 1319074246@qq.com | China | 95 | 58 |
| SHENYANG SINOCHEM BIOTECH CO.,LTD | 23769576 13840269002 | 274311108@qq.com | China | 255 | 58 |
| henyang Zhuohua Biotechnology Co., Ltd. | 13940293610 13940293610 | 332189598@qq.com | China | 96 | 58 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| Meryer (Shanghai) Chemical Technology Co., Ltd. | 4006356688 18621169109 | market03@meryer.com | China | 40202 | 62 |
| 3B Pharmachem (Wuhan) International Co.,Ltd. | 18930552037 | 3bsc@sina.com | China | 15813 | 69 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| TCI (Shanghai) Development Co., Ltd. | 021-67121386 | Sales-CN@TCIchemicals.com | China | 24512 | 81 |
| Beijing HwrkChemical Technology Co., Ltd | 89508211 18501085097 | sales.bj@hwrkchemical.com | China | 9407 | 55 |
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Related Questions
Ask a questionView Lastest Price from Methyl Orange manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-09-02 | Methyl Orange
547-58-0
|
$1.00-10.00 | 1kg | 99% | Henan Fengda Chemical Co., Ltd | ||
 |
2026-05-28 | Methyl Orange
547-58-0
|
$5.70 | 10KG | 99.9% | 10000kg | Hebei Chuanghai Biotechnology Co,.LTD | |
 |
2026-05-18 | Methyl Orange
547-58-0
|
1kg | 98% | Hefei Lbao Physical & Chemical Science Co.,Ltd |
-
- Methyl Orange
547-58-0
- $1.00-10.00
- 99%
- Henan Fengda Chemical Co., Ltd
-
- Methyl Orange
547-58-0
- $5.70
- 99.9%
- Hebei Chuanghai Biotechnology Co,.LTD
-
- Methyl Orange
547-58-0
- $0.00
- 98%
- Hefei Lbao Physical & Chemical Science Co.,Ltd
