Yes please explain to us what the forget that is.
Alrighty.
Potassium sulfide is the chemical compound with the formula K2S. It is an inorganic polymer with the "antifluorite structure," which means that the small K+ ions occupy the tetrahedral (F−) sites in fluorite, and the larger S2− centers occupy the eight-coordinate (Ca2+) sites. Li2S, Na2S, and Rb2S crystallize similarly.
This salt contains the highly basic anion S2−, which completely hydrolyzes in water according to the following equation:
K2S + H2O → KOH + KSH
For many purposes, this reaction is inconsequential since the mixture of SH− and OH− behaves as a source of S2−. Other alkali metal sulfides behave similarly.
K2S arises from the reaction of potassium and sulfur. In the laboratory, this synthesis is usually conducted in a solution of anhydrous ammonia.
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