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Date: 31-1-2018
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Date: 29-11-2018
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Date: 8-3-2017
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Potassium reacts so violently with water that it bursts into flame. The silvery white metal is very soft and reacts rapidly with the oxygen in air. Its chemical symbol is derived from the Latin word kalium which means "alkali". Its English name is from potash which is the common name for a compound containing it.
Reactant | Reaction | Product |
---|---|---|
H2 | begins slowly at ca 200°C; rapid above 300°C | KH |
O2 | begins slowly with solid; fairly rapid with liquid | K2O, K2O2, KO2 |
H2O | extremely vigorous and frequently results in hydrogen–air explosions | KOH, H2 |
C(graphite) | 150–400°C | KC4, KC8, KC24 |
CO | forms unstable carbonyls | (KCO) |
NH3 | dissolves as K; iron, nickel, and other metals catalyze in gas and liquid phase | KNH2 |
S | molten state in liquid ammonia | K2S, K2S2, K2S4 |
F2, Cl2, Br2 | violent to explosive | KF, KCl, KBr |
I2 | ignition | KI |
CO2 | occurs readily, but is sometimes explosive | CO, C, K2CO3 |
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