Methyl Red sodium salt Property

Melting point:

178-182 °C

Boiling point:

64.7 °C

Density 

0.791

Flash point:

12 °C

storage temp. 

Store at +5°C to +30°C.

solubility 

H₂O: soluble

form 

Solid

pka

2.3, 5.0(at 25℃)

Colour Index 

13020

color 

White to yellow or beige, darkening on exposure to light

Odor

Odorless

PH Range

Red (1.2) to orange (3.4);Red (4.2) to yellow (6.3)

PH

8.2 (10g/l, H2O, 25℃)

Water Solubility 

Soluble in water. Slightly soluble in ethanol.

λmax

437nm, 410nm, 493nm

BRN 

4065488

Stability:

Reported to be unstable, but this is probably a mistake on a commercial MSDS sheet. Incompatible with strong oxidizing agents.

Major Application

optical fibers, liquid crystal cells, holography, inks, toner, corrosion inhibitor, detergent

CAS DataBase Reference

845-10-3(CAS DataBase Reference)

EPA Substance Registry System

Benzoic acid, 2-[[4-(dimethylamino)phenyl]azo]-, sodium salt (845-10-3)

Safety

Hazard Codes 

Xn,C,F

Risk 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

HS Code 

29270000

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H302Harmful if swallowed

H312Harmful in contact with skin

H315Causes skin irritation

H319Causes serious eye irritation

H332Harmful if inhaled

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P270Do not eat, drink or smoke when using this product.

P271Use only outdoors or in a well-ventilated area.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

P302+P352IF ON SKIN: wash with plenty of soap and water.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P312Call a POISON CENTER or doctor/physician if you feel unwell.

P321Specific treatment (see … on this label).

P322Specific measures (see …on this label).

P330Rinse mouth.

P332+P313IF SKIN irritation occurs: Get medical advice/attention.

P362Take off contaminated clothing and wash before reuse.

P363Wash contaminated clothing before reuse.

P501Dispose of contents/container to..…

Methyl Red sodium salt Chemical Properties,Usage,Production

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.