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Potassium(CAS No. 7440-09-7)

Potassium K (cas 7440-09-7) Molecular Structure

7440-09-7 Structure

Identification and Related Records

【CAS Registry number】
Potassium chunks
Potassium sticks
Potassium standard solution 1000 ppm
Potassium solution 1000 ppm
Potassium solution 10 000 ppm
【Molecular Weight】
【MOL File】

Chemical and Physical Properties

silver solid.
【Melting Point】
【Boiling Point】
【Refractive Index】
n20/D 1.334
【Flash Point】
Reacts violently in water.
Stable. Moisture and air-sensitive. Spontaneously combustible through the generation and ignition of hydrogen. Reacts violently with water and acids, alcohols, carbon monoxide. Store under oil.
【Storage temp】

Safety and Handling

【Hazard Codes】
【Risk Statements】
【Safety Statements 】

Hazard Codes:??FlammableF,CorrosiveC
Risk Statements: 14/15-34
R14/15: Reacts violently with water, liberating extremely flammable gases?
R34: Causes burns?
Safety Statements: 8-43-45-5B-5*
S8: Keep container dry?
S43: In case of fire, use ... (indicate in the space the precise type of fire-fighting equipment. If water increases the risk add - Never use water)?
S45: In case of accident or if you feel unwell, seek medical advice immediately (show label where possible)?
S5: Keep contents under ... (appropriate liquid to be specified by the manufacturer)??
RIDADR: UN 2257 4.3/PG 1
WGK Germany: 2
RTECS :TS8050000
HazardClass: 4.3
PackingGroup: I
The toxicity of potassium compounds is almost always that of the anion, not of potassium. A dangerous fire hazard. Metallic potassium reacts with moisture to form potassium hydroxide and hydrogen. The reaction evolves much heat, causing the potassium to melt and spatter. The reaction also ignites the hydrogen, which burns, or if there is any confinement, may explode. It can ignite spontaneously in moist air. Store under mineral oil. Potassium metal will form the peroxide (K2O2) and the superoxide (KO3 or K2O4) at room temperature even when stored under mineral oil. These oxides can explode on contact with organic materials. Metal that has oxidized on storage under oil may explode violently when handled or cut. Oxide-coated potassium should be destroyed by burning.
Danger: burning potassium is difficult to extinguish; dry powdered soda ash or graphite or special mixtures of dry chemical are recommended.
A violent explosion hazard with the following materials under required conditions of temperature, pressure, and state of division: acetylene, air, moist air, alcohols (e.g., n-propanol through n-octanol, benzyl alcohol, cyclohexanol), AlBr3, ammonium nitrate + ammonium sulfate, ammonium chlorocuprate, NH4Br, NH4I, antimony halides, arsenic halides, AsH3 + NH3, Bi2O3, boric acid, BBr3, carbon disulfide (impact-sensitive), solid carbon dioxide, carbon monoxide, chlorinated hydrocarbons (e.g., chloroethane, dichloroethane, dichloromethane, trichloroethane, chloroform, pentachloroethane, carbon tetrachloride, tetrachloroethane), halocarbons (e.g., bromoform, dibromomethane, diiodomethane), iodine (impact-sensitive), interhalogens (e.g., chlorine trifluoride, iodine bromide, iodine chloride, iodine pentafluoride, iodine trichloride), ClO, CrO3, Cu2OCl2, CuO, ethylene oxide, fluorine, graphite, graphite + air, graphite + K2O2, hydrogen iodide, H2O2, hydrogen chloride, hydrazine, Pb2OCl2, PbO2, PbSO4, maleic anhydride, metal halides (e.g., calcium bromide, iron(III) bromide, iron(III) chloride, iron(II) chloride, iron(II) bromide, iron(II) iodide, cobalt(II) chloride, chromium tetrachloride, silver fluoride, mercury(II) bromide, mercury(II) chloride, mercury(II) fluoride, mercury(II) iodide, copper(I) chloride, copper(I) iodide, copper(II) bromide, copper(II) chloride, ammonium tetrachlorocuprate, zinc chlorides, bromides, or iodides, cadmium chlorides, bromides or iodides, aluminum fluorides, chlorides, or bromides, thallium(I) bromide, tin chlorides, tin iodide, arsenic trichloride, arsenic triiodide, antimony tribromides, trichlorides or triiodides, bismuth tribromides, trichlorides, or triiodides, vanadium(V) chloride, manganese(II) chloride, nickel bromide, chloride, or iodide), metal oxides (e.g., lead peroxide, mercury(I) oxide, MoO3), nitric acid, nitrogen-containing explosives (e.g., ammonium nitrate, picric acid, nitrobenzene), nonmetal halides (e.g., diselenium dichloride, seleninyl chloride, seleninyl bromide, sulfur dichloride, sulfur dibromide, phosphorus tribromide, phosphorus trichloride, phosgene, disulfur dichloride), nonmetal oxides (e.g., dichlorine oxide, dinitrogen tetraoxide, dinitrogen pentaoxide, NO2, P2O5), oxalyl dibromide, oxalyl dichloride, P2NF, peroxides, COCl2, PH3 + NH3, phosphorus, PCl5, PBr3, potassium chlorocuprate, potassium oxides (e.g., KO3, K2O2, KO2), selenium, SeOCl2, SiCl4, AgIO3, NaIO3, NH3 + NaNO2, Na2O2, SnI4 + S, SnO2, S, sulfuric acid, tellurium, thiophosphoryl fluoride, VOCl2, water.
Other hazardous reactions may occur with carbon (e.g., soot, graphite, activated charcoal), dimethyl sulfoxide, ethylene oxide, chlorine, bromine vapor, hydrogen bromide, potassium iodide + magnesium bromide, chloride or iodide, maleic anhydride, mercury, copper(II) oxide, mercury(II) oxide, tin(IV) oxide, molybdenum(III) oxide, bismuth trioxide, phosphorus trichloride, sulfur dioxide, chromium trioxide.
When heated to decomposition it emits toxic fumes of K2O.

【PackingGroup 】
UN 2257/1420

?Potassium (CAS NO.7440-09-7), its Synonyms are Kalium ; Potassium ; Potassium, (liquid alloy) ; Potassium, metal . It is soft silvery metal, tarnishing upon exposure to air.


Reported in EPA TSCA Inventory.

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