Potassium
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.
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GENERAL PROPERTIES
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Symbol: |
K |
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Atomic Number: |
19 |
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Atomic Weight: |
39.0983 |
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Density: |
0.862 gm/cc |
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Melting Point: |
63.25 oC |
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Boiling Point: |
760 oC |
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Thermal Conductivity: |
1.025 W/cm/K @ 298.2 K |
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Electrical Resistivity: |
6.15 microhm-cm @ 0 oC |
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Electronegativity: |
0.8 Paulings |
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Specific Heat: |
0.180 Cal/g/K @ 25 oC |
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Heat of Vaporization: |
18.9 K-Cal/gm atom at 760 oC |
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Heat of Fusion: |
0.574 Cal/gm mole
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ALKALI METALS VIDEO CLIPS
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Courtesy of Open University
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TYPICAL ANALYSES - Impurities in ppm
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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
SPECIFICATIONS:
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Pre-Scored: |
Size |
O.D. |
Length |
Glass Type |
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1 Gram |
10.5 mm |
50-52 mm |
Pyrex |
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5 Gram |
16.6 mm |
70 mm |
Pyrex |
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25 Gram |
22.5 mm |
15 mm |
Pyrex |
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Breakseal: |
1 Gram |
10 mm |
180 mm |
Pyrex |
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5 Gram |
13 mm |
230 mm |
Pyrex |
POTASSIUM METAL
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Material |
Purity |
Potassium Metal 1g Pre-Scored Ampoule  |
3N5 |
| Potassium Metal 1g Breakseal Ampoule | 3N5 |
| Potassium Metal 5 gm Pre-Scored Ampoule | 3N5 |
| Potassium Metal 5 gm Breakseal Ampoule | 3N5 |
| Potassium Metal 25 gm Pre-Scored Ampoule | 3N5 |
Sodium Metal is packaged under argon to order and sold by the gram or kilogram and. Call or This email address is being protected from spambots. You need JavaScript enabled to view it. for additional specifications or custom requirements.
POTASSIUM COMPOUNDS
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Material |
Purity |
| Potassium Carbonate K2CO3 -100 Mesh | 5N |
| Potassium Chloride KCl -40 Mesh | 5N |
| Potassium Hexachloroosmate K2OsCl6 | 4N, 5N |
| Potassium Hexafluoroarsenate | 3N |
| Potassium Iodide | 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. Call or This email address is being protected from spambots. You need JavaScript enabled to view it. for additional specifications or custom requirements.
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ALLOYS 
