Product Identification

Product Name

Acid Red 2

Synonyms

4-(2-Carboxyphenylazo)-N,N-dimethylaniline
4'-Dimethylaminoazobenzene-2-carboxylic acid
Acid Red 2
C.I. 13020
p-(Dimethylamino)azobenzene-o-carboxylic acid

CAS

493-52-7

Formula

C15H15N3O2

Molecular Weight

269.31

EINECS

207-776-1

RTECS

DG8960000

RTECS Class

Tumorigen; Mutagen

Merck

12,6199

Beilstein/Gmelin

750102

Beilstein Reference

4-16-00-00504

Physical and Chemical Properties

Appearance

Glistening, violet crystals from toluene.

Solubility in water

Insoluble

Melting Point

178 - 182

Density

1.31 g/cm3

pKa/pKb

2.5 (pKa)

Usage

As indicator in 0.1% Alcoholic soln, ph: 4.4 Red, 6.2 Yellow, used for titrating nh3, weak organic bases, eg, alkaloids, not suitable for organic acids, except oxalic & picric acid.

First Aid Measures

Ingestion

Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Wash mouth out with water.

Inhalation

Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.

Skin

Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Store in a cool, dry, well-ventilated area away from incompatible substances.

Handling

Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with skin and eyes. Avoid ingestion and inhalation.

Hazards Identification

Inhalation

May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.

Skin

May cause skin irritation.

Eyes

Contact may cause transient eye irritation. This product contains an anionic dye. Similar dyes have not caused injury to the cornea or conjunctiva in documented exposure cases with human or rabbit eyes.

Ingestion

May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.

EC Safety Phrase

S 22 24/25

UN (DOT)

1230

Exposure Controls/Personal Protection

Personal Protection

Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

Substance may have carcinogenic potential.

Poison Class

4 (Substances and products that must be considered harmful)

Fire Fighting Measures

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Combustion generates toxic fumes. Extinguishing media: For small fires, use water spray, dry chemical, carbon dioxide or chemical foam.

Accidental Release Measures

Small spills/leaks

Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity

Disposal Code

3

Stability

Stable under normal temperatures and pressures. Materials containing similar functional groups can decompose at elevated temperatures.

Incompatibilities

Strong oxidizing agents.

Decomposition

Nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Transport Information

UN Number

1230

HS Code

2927 00 00