Potassium oxide
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Potassium oxide (K2O) is an ionic compound of potassium and oxygen. It is a base. This pale yellow solid is the simplest oxide of potassium. It is a highly reactive compound that is rarely encountered. Some industrial materials, such as fertilizers and cements, are assayed assuming the percent composition that would be equivalent to K2O.
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
potassium oxide | |
Systematic IUPAC name
potassium oxidopotassium | |
Other names
potash, dipotassium oxide | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.032.012 |
EC Number |
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MeSH | Potassium+oxide |
PubChem CID |
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UNII | |
UN number | 2033 |
CompTox Dashboard (EPA) |
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Properties | |
K2O | |
Molar mass | 94.196 g·mol−1 |
Appearance | Pale yellow solid |
Odor | Odorless |
Density | 2.32 g/cm3 (20 °C)[1] 2.13 g/cm3 (24 °C)[2] |
Melting point | 740 °C (1,360 °F; 1,010 K)[2] |
Reacts[1] forming KOH | |
Solubility | Soluble in diethyl ether[2] |
Structure | |
Antifluorite cubic, cF12[3] | |
Fm3m, No. 225[3] | |
α = 90°, β = 90°, γ = 90° | |
Tetrahedral (K+) Cubic (O2−) | |
Thermochemistry | |
Heat capacity (C) |
83.62 J/mol·K[4] |
Std molar entropy (S⦵298) |
94.03 J/mol·K[4] |
Std enthalpy of formation (ΔfH⦵298) |
−363.17 kJ/mol[1][4] |
Gibbs free energy (ΔfG⦵) |
−322.1 kJ/mol[1] |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Corrosive, reacts violently with water |
GHS labelling: | |
Danger | |
H314 | |
P260, P264, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P405, P501 | |
NFPA 704 (fire diamond) | |
Safety data sheet (SDS) | ICSC 0769 |
Related compounds | |
Other anions |
Potassium sulfide Potassium selenide Potassium telluride Potassium polonide |
Other cations |
Lithium oxide Sodium oxide Rubidium oxide Caesium oxide |
Potassium peroxide Potassium superoxide Potassium ozonide | |
Related compounds |
Potassium hydroxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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