Potassium sulfide

Potassium sulfide is an ionic compound with the formula K₂S, composed of potassium cations and sulfide anions. It is highly reactive with water and moisture, producing potassium hydroxide and hydrogen sulfide.

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Potassium: Potassium is a soft, highly reactive alkali metal with atomic number 19 and a common +1 oxidation state. Each formula unit contains two potassium atoms, each forming a K⁺ ion.
Hydrolysis: Hydrolysis is a chemical reaction in which water breaks or transforms chemical bonds. Water reacts with sulfide in potassium sulfide to form hydroxide and hydrogen sulfide.
Potassium polysulfide: Potassium polysulfide is a family of compounds containing potassium ions and sulfur chains, commonly represented as K₂Sₓ. Adding sulfur to potassium sulfide produces polysulfide mixtures used in sulfur chemistry.
Potassium hydrosulfide: Potassium hydrosulfide is an ionic compound with the formula KHS, containing potassium and hydrosulfide ions. Unlike K₂S, it contains HS⁻ and has a different potassium-to-sulfur ratio.
Sulfur: Sulfur is a nonmetallic element with atomic number 16 that commonly forms sulfide ions with a −2 charge. One sulfur atom supplies the S²⁻ ion in each formula unit.
Hydrogen sulfide: Hydrogen sulfide is a colorless, toxic gas with the formula H₂S and a characteristic rotten-egg odor at low concentrations. It is released when potassium sulfide reacts with water or humid air.
Potassium sulfur battery: A potassium–sulfur battery is an electrochemical system that stores energy through reactions between potassium and sulfur species. Potassium sulfide-like products can form during sulfur conversion in these batteries.
Potassium sulfate: Potassium sulfate is an ionic salt with the formula K₂SO₄, containing sulfate ions. Sulfate contains oxidized sulfur bonded to oxygen, unlike the reduced sulfide ion here.
Ionic bond: An ionic bond is the electrostatic attraction between oppositely charged ions. Attraction between K⁺ and S²⁻ holds this compound’s crystal together.
Potassium hydroxide: Potassium hydroxide is a strongly caustic ionic compound with the formula KOH. It is formed alongside hydrogen sulfide during potassium sulfide hydrolysis.