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| Names | |
|---|---|
| IUPAC name Potassium amide | |
| Other names Potassamide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider |
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| ECHA InfoCard | 100.037.508 |
| EC Number |
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| Properties | |
| KNH2 | |
| Molar mass | 55.121 g·mol−1 |
| Appearance | white solid |
| Odor | ammonia-like |
| Density | 1.57 g/cm3 |
| Melting point | 338 °C (640 °F; 611 K) |
| reacts | |
| Solubility | ammonia: 3.6 g/(100 mL) |
| Thermochemistry | |
Std enthalpy of formation(ΔfH⦵298) | −128.9 kJ/mol |
| Related compounds | |
Othercations | Lithium amide Sodium amide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Potassium amide is aninorganic compound with the chemical formulaKNH2. Like otheralkali metal amides, it is a white solid thathydrolyzes readily. It is a strong base.[1]
Potassium amide is produced by the reaction ofammonia withpotassium. The reaction typically requires a catalyst.[2]
TraditionallyKNH2 is viewed as a simple salt, but it has significant covalent character and is highly aggregated in ammonia solution.[citation needed] The compound has been characterized byX-ray crystallography as the solvent-free form[3] as well as the mono- and diammonia solvates. InKNH2·2NH3, the potassium centers are each bonded to two amido ligands and four ammonia ligands, all six of which bridge to adjacent potassium centers. The result is a chain of hexacoordinate potassium ions. The K–NH2 distances are 2.7652(11) whereas the K–NH3 distances are respectively 2.9234(11) and 3.0698(11) Å.[4]
