sodium 2-(p-(dimethylamino)phenylazo)benzoate
Methyl Red sodium salt
CAS: 845-10-3
Molecular Formula: C15H16N3NaO2
sodium 2-(p-(dimethylamino)phenylazo)benzoate - Names and Identifiers
| Name | Methyl Red sodium salt |
| Synonyms | MR S NO 250 Methyl Red sodium salt Methyl Red, water soluble methyl red sodium crystalline Methyl Red, Sodium Salt, Reagent C.I. 13020~Methyl Red, sodium salt O-(P-DIMETHYLAMINOPHENYLAZO)BENZOIC ACID P-DIMETHYLAMINOAZOBENZENE-O-CARBOXYLIC ACID sodium 2-(p-(dimethylamino)phenylazo)benzoate 2-{(E)-[4-(dimethylamino)phenyl]diazenyl}benzoate 2-[4-(Dimethylamino)phenylazo]benzoic acid, sodium salt sodium 2-{(E)-[4-(dimethylamino)phenyl]diazenyl}benzoate O-[[P-(DIMETHYLAMINO)PHENYL]AZO]BENZOIC ACID, SODIUM SALT 2-[4-(Dimethylamino)phenylazo]benzoic acid sodium salt, 4-Dimethylaminoazobenzene-2μ-carboxylic acid sodium salt |
| CAS | 845-10-3 |
| EINECS | 212-682-9 |
| InChI | InChI=1/C15H15N3O2/c1-18(2)12-9-7-11(8-10-12)16-17-14-6-4-3-5-13(14)15(19)20/h3-10H,1-2H3,(H,19,20)/p-1/b17-16+ |
sodium 2-(p-(dimethylamino)phenylazo)benzoate - Physico-chemical Properties
| Molecular Formula | C15H16N3NaO2 |
| Molar Mass | 293.3 |
| Density | 0.791 |
| Melting Point | 178-182 °C |
| Boling Point | 64.7 °C |
| Flash Point | 12 °C |
| Water Solubility | Soluble in water. Slightly soluble in ethanol. |
| Solubility | H2O: soluble |
| Vapor Presure | 5.27E-10mmHg at 25°C |
| Appearance | Crystalline powder |
| Color | White to yellow or beige, darkening on exposure to light |
| Odor | Odorless |
| Maximum wavelength(λmax) | ['437nm, 410nm, 493nm'] |
| BRN | 4065488 |
| pKa | 2.3, 5.0(at 25℃) |
| PH | 8.2 (10g/l, H2O, 25℃) |
| Storage Condition | Store at +5°C to +30°C. |
| Stability | Stability Reported to be unstable, but this is probably a mistake on a commercial MSDS sheet. Incompatible with strong oxidizing agents. |
| Sensitive | Sensitive to light |
| MDL | MFCD00002426 |
| Use | Acid-base indicator, pH color change range 4-4 (red) ~ 6-2 (yellow). Redox indicator. Used for cerium sulfate titration of ferrous ions. |
sodium 2-(p-(dimethylamino)phenylazo)benzoate - Risk and Safety
| Risk Codes | R40 - Limited evidence of a carcinogenic effect R34 - Causes burns R11 - Highly Flammable |
| Safety Description | S36/37 - Wear suitable protective clothing and gloves. S24/25 - Avoid contact with skin and eyes. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S16 - Keep away from sources of ignition. |
| UN IDs | UN 1170 3/PG 2 |
| WGK Germany | 3 |
| TSCA | Yes |
| HS Code | 29270000 |
| Hazard Class | 3 |
| Packing Group | II |
sodium 2-(p-(dimethylamino)phenylazo)benzoate - Introduction
Soluble in water and ethanol. The maximum absorption wavelength is 437nm.
Last Update：2022-10-16 17:29:19
sodium 2-(p-(dimethylamino)phenylazo)benzoate - Reference Information
| Color index | 13020 |
| pH range of acid-base indicator discoloration | Red (1.2) to orange (3.4);Red (4.2) to yellow (6.3) |
| Main application | optical fibers, liquid crystal cells, holography, inks, toner, rosion inhibitor, detent |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Use | acid-base indicator, pH color change range 4.4 (red) to 6.2 (yellow). Redox indicator. For cerium sulfate titration of ferrous ions. |
Last Update：2024-04-09 21:11:58
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View History
sodium 2-(p-(dimethylamino)phenylazo)benzoate
32240-58-7
(1r,3r)-3-(cyanomethyl)-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)cyclobutane-1-carbonitrile
[Bis(trimethylsilyl)amino] potassium
ethyl 4-(3-bromo-5-ethoxy-4-hydroxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate
32240-58-7
(1r,3r)-3-(cyanomethyl)-3-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)cyclobutane-1-carbonitrile
[Bis(trimethylsilyl)amino] potassium
ethyl 4-(3-bromo-5-ethoxy-4-hydroxyphenyl)-6-methyl-2-thioxo-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate