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

Description

Methyl Red sodium salt is an organic compound that serves as a pH indicator, characterized by its ability to change color in response to variations in pH levels. It is commonly used in various applications across different industries due to its color-changing properties and versatility.

Uses

Methyl Red sodium salt is used as a pH indicator for detecting changes in acidity or alkalinity in solutions.
Used in Microbiology:
Methyl Red sodium salt is used as a component in the preparation of agar plates in bacteriology, aiding in the cultivation and observation of bacterial growth.
Used as a Coloring Agent:
Methyl Red sodium salt is used as a coloring agent in various products, providing color and enhancing visual appeal.
Used in Oral Care Products:
Methyl Red sodium salt is used in mouthwashes and toothpastes for its color and potential antimicrobial properties, contributing to oral hygiene and health.
Used in Cosmetics:
Methyl Red sodium salt finds use in cosmetics for its coloring properties, enhancing the appearance of various cosmetic products.
Used in Rocket Propellants:
Methyl Red sodium salt is employed as a component in rocket propellants, contributing to the combustion and propulsion processes.
Used in Stain Preparation:
Methyl Red sodium salt is used in the preparation of reversible stains for rapid detection of stained cells in each specimen, facilitating quick and efficient cell identification in various biological and medical applications.

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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