Potassium

  • Kalium
Formula
K
Structure
Description
Potassium, metal alloys is potassium mixed with some other metal, usually sodium. It is a liquid under normal conditions.
Uses
In synthesis of inorg potassium compd, as heat transfer medium together with sodium, in organic syntheses involving condensation, dehalogenation, reduction, & polymerization reactions.

Registry Numbers and Inventories.
CAS
7440-09-7
EC (EINECS/ELINCS)
231-119-8
EC Index Number
019-001-00-2
EC Class
Reacts violently with water; Highly flammable; Corrosive
R 14/15 34
S 8 43 45
RTECS
TS6460000
RTECS class
Other
UN (DOT)
2257
Merck
12,7763
Beilstein/Gmelin
15203 (G)
Swiss Giftliste 1
G-1729
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
K
Formula mass
39.09
Melting point, °C
63
Boiling point, °C
760
Odor Threshold Odor threshold Odorless
Density
0.86 g/cm3 (20 C)
Solubility in water
Reacts
Heat of fusion
2.4 kJ/mol
Heat of combustion
-182 kJ/mol

Hazards and Protection.
Storage
Do not store near combustible materials. Store in a cool, dry place. Storage under a nitrogen blanket has been recommended.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Do not allow water to get into the container because of violent reaction. Do not get in eyes, on skin, or on clothing. Do not ingest or inhale. Faceshield required. Store and handle protected from air. Avoid mechanical shock and friction.
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 prevent skin exposure.
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.
Small spills/leaks
Cover with limestone and place into a closed container for disposal. Remove all sources of ignition. Use a spark-proof tool. Isolate area and deny entry. Do not expose spill to water. Cover with material such as dry soda ash or calcium carbonate and place into a closed container for disposal.
Stability
Not stable during routine use and handling conditions. Oxidizes when exposed to air.
Incompatibilities
Water; air; carbon dioxide; oxidizing agents; metal halides; non-metal halides; carbon; halocarbons; halogens; hydrogen iodide; metal oxides
Decomposition
Hydrogen gas, oxides of potassium, potassium fume.

Fire.
Autoignition, °C
440
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Forms peroxides of unknown stability. Water Reactive. May react exothermically with water, causing liberation of heat and possible spattering of material. Reacts with water to form explosive hydrogen gas. Extinguishing media: Do NOT use carbon dioxide. Do NOT use alcohol foams. Do NOT use halogenated agents. Use approved class D extinguishing agents or smother with dry sand, clay, or sodium bicarbonate. DO NOT USE WATER!
Fire potential
This material is combustible.
Hazards
Produce flammable gases on contact with water. May ignite on contact with water or moist air. Some react vigorously or explosively on contact with water. May be ignited by heat, sparks or flames. May re-ignite after fire is extinguished. Some are transported in highly flammable liquids. Runoff may create fire or explosion hazard.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
3
 
Flammability
3
 
 
Reactivity
2
 
 
Special
W

Health.
Poison_Class
2
Exposure effects
   Ingestion
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns. May cause systemic toxic effects on the heart, liver, and kidneys.
   Inhalation
May cause lung damage.
   Skin
May cause severe skin irritation with possible burns, especially if skin is wet or moist.
   Eyes
May cause irreversible eye injury. Contact with eyes may cause severe irritation, and possible eye burns.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Get medical aid immediately. Gently lift eyelids and flush continuously with water. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
2257
Response guide
Hazard class
4.3
Packing Group
I
 
USCG CHRIS Code
PTM
 
Std. Transport #
4916446