Potassium hydrosulfide is the inorganic compound with the formula KHS. 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.[2] It is prepared by neutralizing aqueous KOH with H2S.[3] Aqueous solutions of potassium sulfide consist of a mixture of potassium hydrosulfide and potassium hydroxide.

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 high temperatures.[4]

Addition of sulfur gives dipotassium pentasulfide.


Potassium hydrosulfide is synthesized by the reaction between a solution of potassium sulfide with excess hydrogen sulfide.


  1. ^ Lide, David R., ed. (2009). CRC Handbook of Chemistry and Physics (90th ed.). Boca Raton, Florida: CRC Press. p. 4-82. ISBN 978-1-4200-9084-0. 
  2. ^ Dittmer, D. C. "Potassium Hydrogen Sulfide" in Encyclopedia of Reagents for Organic Synthesis (Ed: L. Paquette) 2004, J. Wiley & Sons, New York. doi: 10.1002/047084289.
  3. ^ Kurzer, F. Lawson, A. "Thiobenzoylthioglycolic Acid" Organic Syntheses, Collected Volume 5, p.1046 (1973). "Archived copy" (PDF). Archived from the original (PDF) on 2011-06-06. Retrieved 2009-07-19. 
  4. ^ 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. doi:10.1063/1.1483860.