Potassium hydrosulfide

Potassium hydrosulfide is the inorganic compound with the formula KSH. This colourless salt consists of the cation K+ and the bisulfide anion [SH]−. It is the product of the half-neutralization of hydrogen sulfide with potassium hydroxide. The compound is used in the synthesis of some organosulfur compounds.[1] Aqueous solutions of potassium sulfide consist of a mixture of potassium hydrosulfide and potassium hydroxide.

Potassium hydrosulfide
Names
IUPAC name
Potassium hydrosulfide
Other names
Potassium bisulfide, Potassium sulfhydrate, potassium hydrogen sulfide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.803
EC Number
  • 215-182-9
UNII
  • InChI=1S/K.H2S/h;1H2/q+1;/p-1 ☒N
    Key: ZOCLAPYLSUCOGI-UHFFFAOYSA-M ☒N
  • InChI=1/K.H2S/h;1H2/q+1;/p-1
    Key: ZOCLAPYLSUCOGI-REWHXWOFAJ
  • [SH-].[K+]
Properties
KSH
Molar mass 72.171 g/mol
Appearance white solid
Density 1.68–1.70 g/cm3
Melting point 455 °C (851 °F; 728 K)
good
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 Flammable solid, stench, releases hydrogen sulfide
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
3
2
0
Related compounds
Other anions
 Potassium hydroxide
Other cations
 Sodium hydrosulfide
Related compounds
 potassium 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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Infobox references

The structure of the potassium hydrosulfide resembles that for potassium chloride. Their structure is however complicated by the non-spherical symmetry of the SH− anions, but these tumble rapidly in the solid.[2]

Addition of sulfur gives dipotassium pentasulfide.

Synthesis

It is prepared by neutralizing aqueous KOH with H2S.[3][4]

References
  1. Dittmer, Donald C. (2001). "Potassium Hydrogen Sulfide". In Paquette, L. (ed.). Encyclopedia of Reagents for Organic Synthesis. J. Wiley & Sons, New York. doi:10.1002/047084289X.rp227. ISBN 0471936235.
  2. Haarmann, F; Jacobs, H.; Roessler, E.; Senker, J. (2002). "Dynamics of Anions and Cations in Hydrogensulfides of Alkali Metals (NaHS, KHS, RbHS): A Proton Nuclear Magnetic Resonance Study". Journal of Chemical Physics. 117 (3): 1269–1276. Bibcode:2002JChPh.117.1269H. doi:10.1063/1.1483860.
  3. Kurzer, F.; Lawson, A. (1962). "Thiobenzoylthioglycolic Acid". Organic Syntheses. 42: 100. doi:10.15227/orgsyn.042.0100.
  4. Robert L. Frank and James R. Blegen (1948). "Benzoyl Disulfide". Organic Syntheses. 28: 16. doi:10.15227/orgsyn.028.0016.
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