845-10-3

Basic information

• Product Name: Methyl Red sodium salt
• Synonyms: S NO 250;MR;P-DIMETHYLAMINOAZOBENZENE-O-CARBOXYLIC ACID;O-(P-DIMETHYLAMINOPHENYLAZO)BENZOIC ACID;O-[[P-(DIMETHYLAMINO)PHENYL]AZO]BENZOIC ACID, SODIUM SALT;2-[[4-(dimethylamino)phenyl]azo]-benzoicacisodiumsalt;Benzoicacid,2-[[4-(dimethylamino)phenyl]azo]-,sodiumsalt;Sodiummethylred
• CAS NO: 845-10-3
• Molecular Formula: C₁₅H₁₄N₃O₂*Na
• Molecular Weight: 269.3
• EINECS: 212-682-9
• Product Categories: Organics;Analytical Chemistry;Indicator (pH);pH Indicators;Azo
• Mol File: 845-10-3.mol
• Article Data: 0

Chemical Properties

• Melting Point: 178-182 °C
• Boiling Point: 64.7 °C
• Flash Point: 12 °C
• Appearance: White to yellow or beige, darkening on exposure to light/Solid
• Density: 0.791
• Vapor Pressure: 5.27E-10mmHg at 25°C
• Storage Temp.: Store at RT.
• Solubility: H2O: soluble
• PKA: 2.3, 5.0(at 25℃)
• Water Solubility: Soluble in water. Slightly soluble in ethanol.
• Stability: Stability Reported to be unstable, but this is probably a mistake on a commercial MSDS sheet. Incompatible with strong oxidizing
• BRN: 4065488
• CAS DataBase Reference: Methyl Red sodium salt(CAS DataBase Reference)
• NIST Chemistry Reference: Methyl Red sodium salt(845-10-3)
• EPA Substance Registry System: Methyl Red sodium salt(845-10-3)

Safety Data

• Hazard Codes: Xn,C,F
• Statements: 40-34-11
• Safety Statements: 36/37-24/25-45-36/37/39-26-16
• RIDADR: UN 1170 3/PG 2
• WGK Germany: 3
• TSCA: Yes
• HazardClass: 3
• PackingGroup: II
• Hazardous Substances Data: 845-10-3(Hazardous Substances Data)

Usage

Chemical Properties

orange powder

Uses

Methyl Red sodium salt is used as a pH indicator. In microbiology, it is used to make agar plates in bacteriology. Further, it is used as a coloring agent and also finds use in mouthwash, toothpaste and in cosmetics. It is also employed as a rocket propellant. In addition to this, it is used in the preparation of reversible stain for rapid detection of stained cells in each specimen.

General Description

Methyl red sodium salt is the sodium salt of methyl red synthetic dye, which belongs to the azo group of dyes.

Biochem/physiol Actions

Methyl Red is a pH indicator and it changes color at a pH of 5.5.

Purification Methods

It can be precipitated from aqueous solution as the free acid which is recrystallised from 95% EtOH, then reconverted to the sodium salt. In H2O it is pink at pH 4.2 and yellow at pH 6.2 and has at 437nm.

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+

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