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Potassium sulfide
Chemical compound / From Wikipedia, the free encyclopedia
Potassium sulfide is an inorganic compound with the formula K2S. The colourless solid is rarely encountered, because it reacts readily with water, a reaction that affords potassium hydrosulfide (KSH) and potassium hydroxide (KOH). Most commonly, the term potassium sulfide refers loosely to this mixture, not the anhydrous solid.
Quick Facts Names, Identifiers ...
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Names | |
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IUPAC name
Potassium sulfide | |
Other names
Dipotassium monosulfide, Dipotassium sulfide, Potassium monosulfide, Potassium sulfide | |
Identifiers | |
3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.013.816 ![]() |
EC Number |
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PubChem CID |
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RTECS number |
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UNII | |
UN number | 1847 1382 |
CompTox Dashboard (EPA) |
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Properties | |
K2S | |
Molar mass | 110.262 g/mol |
Appearance | pure: colourless impure: yellow-brown |
Odor | H2S |
Density | 1.74 g/cm3 |
Melting point | 840 °C (1,540 °F; 1,110 K) |
Boiling point | 912 °C (1,674 °F; 1,185 K) (decomposes) |
converts to KSH, KOH | |
Solubility in other solvents | soluble in ethanol, glycerol insoluble in ether |
−60.0·10−6 cm3/mol | |
Structure | |
antiFluorite | |
Thermochemistry | |
Std molar entropy (S⦵298) |
105.00 J·mol−1·K−1[1] |
Std enthalpy of formation (ΔfH⦵298) |
-406.2 kJ·mol−1[2] |
Gibbs free energy (ΔfG⦵) |
-392.4 kJ·mol[2] |
Hazards | |
Occupational safety and health (OHS/OSH): | |
Main hazards |
Causes skin burns. Dangerous for the environment |
GHS labelling: | |
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Danger | |
H314, H400 | |
P260, P264, P273, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P321, P363, P391, P405, P501 | |
Related compounds | |
Other anions |
Potassium oxide Potassium selenide Potassium telluride Potassium polonide |
Other cations |
Lithium sulfide Sodium sulfide Rubidium sulfide Caesium sulfide |
Related compounds |
Potassium hydrosulfide Potassium sulfite Potassium sulfate Iron(II) sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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