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Potassium sulfide is an inorganic compound with the formula K 2 S. The colourless solid is rarely encountered, because it reacts readily with water, a reaction that affords potassium hydrosulfide (KSH) and potassium hydroxide (KOH).
Lewis structure of a water molecule. Lewis structures – also called Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDs) – are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.
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Aqueous solutions of potassium sulfide consist of a mixture of potassium hydrosulfide and potassium hydroxide. The structure of the potassium hydrosulfide resembles that of potassium chloride. Their structure is however complicated by the non-spherical symmetry of the SH − anions, but these tumble rapidly in the solid. [2]
The salt is prepared by the addition of elemental sulfur to potassium sulfide. An idealized equation is shown for potassium hydrosulfide: 4 KSH + S 8 → 2 K 2 S 5 + 2 H 2 S. The structure consists of zigzag chains of S 2− 5 paired with K + ions. [2]
Silicon sulfide is also a chain compound. Cyclic SiS 2 has been reported to exist in the gas phase. [95] The phase diagram of silicon with selenium has two phases: SiSe 2 and SiSe. [96] Tellurium silicide is a semiconductor with formula TeSi 2 or Te 2 Si 3. [97]
The combustion products of smokeless powder are mainly gaseous, compared to around 55% solid products (mostly potassium carbonate, potassium sulfate, and potassium sulfide) for black powder. [1] In addition, smokeless powder does not leave the thick, heavy fouling of hygroscopic material associated with black powder that causes rusting of the ...
Fragment of the solid-state structure of Na 2 S 5. The S 2− 5 chain consists of the yellow-colored atoms. [3] The alkali metal polysulfides arise by treatment of a solution of the sulfide with elemental sulfur, e.g. sodium sulfide to sodium polysulfide: S 2− + n S → S 2− n+1