Benzenesulfonic acid, 4-((2,4-dihydroxyphenyl)azo)-, monosodium salt

Formula
C12H9N2NaO5S
Structure
Description
Brown powder
Uses
Used as a indicator.

Registry Numbers and Inventories.
CAS
547-57-9
EC (EINECS/ELINCS)
208-924-8
RTECS
DB6145180
RTECS class
Other
Merck
12,9905
Beilstein/Gmelin
4173410
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C12H9N2O5S*Na
Melting point, °C
0
Solubility in water
Soluble

Hazards and Protection.
Storage
Store in a cool, dry place. Keep container closed when not in use.
Handling
Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Incompatibilities
Strong oxidizing agents.
Decomposition
Nitrogen oxides, carbon monoxide, oxides of sulfur, carbon dioxide.

Fire.
Fire fighting
Wear approved SCBA in full pressure-demand and full protective gear. Extinguish fire using water, dry chemical, chemical foam, or alcohol-resistant foam.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Get medical aid. 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.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower lids. Get medical aid.

Transport.