|
POTASSIUM
(K)
MATERIAL
OVERVIEW
Characteristics:
Soft, silvery metal; rapidly oxidized in moist air.
Soluble in liquid ammonia, aniline, mercury, and
sodium.
Hazards:
Dangerous fire risk; reacts with moisture to form
potassium hydroxide and hydrogen. The reaction evolves
much heat causing the potassium to melt and splatter.
It also ignites the hydrogen. Burning potassium is
difficult to extinguish; dry powdered soda ash or
graphite or special mixtures of dry chemical is
recommended. It can ignite spontaneously in moist air.
Moderate explosion risk by chemical reaction.
Potassium metal will form the peroxide and the
superoxide at room temperature even when stored under
mineral oil; may explode violently when handled or
cut. Oxide-coated potassium should be destroyed by
burning. Store in inert atmospheres, such as argon or
nitrogen, or under liquids which are oxygen-free, such
as toluene or kerosene, or in glass capsules which
have been filled under vacuum or inert atmosphere.
GENERAL
PROPERTIES
|
Symbol:
|
K
|
|
Atomic
Number:
|
19
|
|
Atomic
Weight:
|
39.0983
|
|
Density:
|
0.862
gm/cc
|
|
Melting
Point:
|
63.25
oC
|
|
Boiling
Point:
|
760
oC
|
|
Thermal
Conductivity:
|
1.025
W/cm/oK
@ 298.2 oK
|
|
Electrical
Resistivity:
|
6.15
microhm-cm @ 0 oC
|
|
Electronegativity:
|
0.8
Paulings
|
|
Specific
Heat:
|
0.180
Cal/g/oK
@ 25 oC
|
|
Heat
of Vaporization:
|
18.9
K-Cal/gm atom at 760 oC
|
|
Heat
of Fusion:
|
0.574
Cal/gm mole
|
TYPICAL
ANALYSES
Impurities
in ppm
|
Material
/ Purity:
|
3N
|
3N7
|
|
Ag
|
10.0
|
<1.0
|
|
Al
|
50.0
|
<5.0
|
|
B
|
10.0
|
1.0
|
|
Ba
|
20.0
|
2.0
|
|
Be
|
10.0
|
<1.0
|
|
Ca
|
100.0
|
<5.0
|
|
Cr
|
50.0
|
<5.0
|
|
Co
|
50.0
|
<5.0
|
|
Cu
|
20.0
|
3.0
|
|
Fe
|
50.0
|
<5.0
|
|
Mg
|
30.0
|
4.0
|
|
Mn
|
10.0
|
1.0
|
|
Mo
|
50.0
|
<5.0
|
|
Na
|
250.0
|
30.0
|
|
Ni
|
10.0
|
<1.0
|
|
Pb
|
50.0
|
<5.0
|
|
Si
|
10.0
|
2.0
|
|
Ti
|
100.0
|
15.0
|
|
V
|
50.0
|
<5.0
|
Packaging
|
|
|
|
Pre-Scored Ampoule
|
Breakseal Ampoule
|
SPECIFICATIONS:
|
Pre-Scored:
|
Size
|
O.D.
|
Length
|
Glass Type
|
|
1
Gram
|
10.5
mm
|
50-52
mm
|
Pyrex
|
|
5
Gram
|
16.6
mm
|
70
mm
|
Pyrex
|
|
25
Gram
|
22.5
mm
|
15
mm
|
Pyrex
|
|
50
Gram
|
28.5
mm
|
160
mm
|
Pyrex
|
|
Breakseal:
|
1
Gram
|
10
mm
|
180
mm
|
Pyrex
|
|
5
Gram
|
13
mm
|
230
mm
|
Pyrex
|
POTASSIUM
METAL
|
Material
|
Purity
|
|
Potassium
Metal Ampoule 1g
|
3N
|
|
Potassium
Metal 5 gm Pre-Scored Ampoule
|
3N5
|
|
Potassium
Metal 5 gm Straight Breakseal Ampoule
|
3N5
|
|
Potassium
Metal 25 gm Pre-Scored Ampoule
|
3N5
|
|
Potassium
Metal 25 gm Straight Breakseal Ampoule
|
3N5
|
|
Potassium
Metal 50 gm Pre-Scored Ampoule
|
3N5
|
|
Potassium
Metal 50 gm Straight Breakseal Ampoule
|
3N5
|
Potassium
is packaged in ampoules under argon and sold by the
gram. Ingot,
Lump, and Sticks are packaged under Mineral Oil.
POTASSIUM
COMPOUNDS
|
Material
|
Purity
|
|
Potassium
Carbonate K2CO3
-100 Mesh
|
5N
|
|
Potassium
Chloride KCl
-40 Mesh
|
5N
|
|
Potassium
Fluoride KF
-60 Mesh
|
4N
|
|
Potassium
Hexafluoroantimonate KSbF6 -6 Mesh 3N
|
3N
|
|
Potassium
Iodate KIO3
-80 Mesh 3N
|
3N
|
|
Potassium
Molybdate K2MoO4
-200 Mesh
|
3N
|
|
Potassium
Perrhenate KReO4
-40 Mesh
|
3N
|
Compounds
are packaged to order and sold by the gram or
kilogram.
|
