Potassium hydrosulfide
Potassium hydrosulfide is an inorganic compound with the formula KSH. This colourless salt consists of the cation and the bisulfide anion. It is the product of the half-neutralization of hydrogen sulfide with potassium hydroxide. The compound has been used in the synthesis of organosulfur compounds. Aqueous solutions of potassium sulfide consist of a mixture of potassium hydrosulfide and potassium hydroxide.
file:Sodium-hydrosulfide-LT-xtal-1991-CM-3D-balls.png|thumb|left|194px|Atomic structure of crystalline KSH according to X-ray crystallography. Color code: violet = K, yellow = S, white = H.
The structure of the potassium hydrosulfide resembles that of potassium chloride. Their structure is however complicated by the non-spherical symmetry of the anions, but these tumble rapidly in the solid.
Potassium hydrosulfide reacts with elemental sulfur to gives polysulfide salts, such as dipotassium pentasulfide.