Perchloric acid

  • Perchloric acid, with more than 50% but not more than 72% acid
Formula
HClO4
Structure
Description
A clear colorless odorless aqueous solution.
Uses
In analytical chemistry as an oxidizer & for separation of potassium from sodium.

Registry Numbers and Inventories.
CAS
7601-90-3
EC (EINECS/ELINCS)
231-512-4
EC Index Number
017-006-00-4
EC Class
Heating may cause an explosion; Oxidising; Corrosive
R 5 8 35
S 23 26 36 45
RTECS
SC7500000
RTECS class
Z Other (Z)
UN (DOT)
1873
Merck
12,7296
Beilstein/Gmelin
1474088 (G)
Beilstein Reference
NA
Swiss Giftliste 1
G-3036
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
Cl2H2O8
Formula mass
100.46
Melting point, °C
-112.2
Boiling point, °C
181
Vapor pressure, mmHg
6.8 (25 C)
Density
1.768 g/cm3 (22 C)
Solubility in water
Miscible
Refractive index
1.42 (20 C)

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear full acid protective clothing and self-contained breathing apparatus resistant to acid corrosion.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Neutralize spilled material with crushed limestone, soda ash, or lime.
Stability
Highly reactive under confinement, extreme caution.
Incompatibilities
May react vigorously or deflagrate when mixed with oxidizable material.

Fire.
Flash Point,°C
40
Fire fighting
Use water in flooding quantities as fog. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Nonflammable-may heat combustibles to auto ignition point.
Hazards
These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.
Combustion products
Poisonous gases may be produced in fire.
Health
3
 
Flammability
0
 
 
Reactivity
3
 
 
Special
O

Health.
Poison_Class
1
Exposure effects
Abnormal neuropsychologic function has been reported following hydrochloric acid exposure from a leaking tanker truck.
   Ingestion
Ingestion of acids may result in burns, gastrointestinal bleeding, gastritis, perforations, dilation, edema, necrosis, vomiting, stenosis, fistula, and duodenal/jejunal injury.
   Inhalation
Inhalation may produce dyspnea, pleuritic chest pain, upper airway edema, pulmonary edema, hypoxemia, bronchospasm, pneumonitis, and persistent pulmonary function abnormalities. Airway hyperreactivity has also been reported.
   Skin
Contact may result in injury, burns and death.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move to fresh air; give oxygen if necessary.
   Skin
Flush with water.
   Eyes
Flush with water for at least 15 min.

Transport.
UN number
1873
Response guide
Hazard class
5.1
Packing Group
I
 
USCG CHRIS Code
PCL
 
Std. Transport #
4930215