Potassium hydrosulfide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Potassium hydrosulfide
CAS number 1310-61-8 YesY
PubChem 102109
EC number 215-182-9
Jmol-3D images Image 1
Molecular formula HKS
Molar mass 72.171 g/mol
Appearance white solid
Density 1.68–1.70 g/cm3
Melting point 455 °C (851 °F; 728 K)
Solubility in water good
EU Index Not listed
Main hazards Flammable solid, stench, releases hydrogen sulfide
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 3: Short exposure could cause serious temporary or residual injury. E.g., chlorine gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Other anions Potassium hydroxide
Other cations Sodium hydrosulfide
Related compounds potassium sulfide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

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.[1] It is prepared by neutralizing aqueous KOH with H2S.[2] 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.[3]

Addition of sulfur gives dipotassium pentasulfide.


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


  1. ^ 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.
  2. ^ Kurzer, F. Lawson, A. “Thiobenzoylthioglycolic Acid” Organic Syntheses, Collected Volume 5, p.1046 (1973). [1]
  3. ^ 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.