Potassium sulfide
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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 ...
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: | |
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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