Potassium Sulfide definition of Potassium Sulfide in the Free Online Encyclopedia.

potassium sulfide [pə′tas·ē·əm ′səl‚fīd]

(inorganic chemistry)

K₂S Moderately flammable, water-soluble, deliquescent red crystals; melts at 840°C; used in analytical chemistry, medicine, and depilatories. Also known as fused potassium sulfide; hepar sulfuris; potassium sulfuret.

Potassium Sulfide

K₂S, a salt; colorless crystals. Density, 1.80 g/cm³; melting point, 471°C.

Potassium sulfide is hygroscopic and highly water-soluble. It readily oxidizes on exposure to atmospheric oxygen to potassium thiosulfate, K₂S₂O₃. Boiling aqueous potassium sulfide with excess sulfur forms the potassium polysulfides K₂S₂, K₂S₃, K₂S₄, K₂S₅, and K₂S₆. Potassium sulfide is obtained by the reactions:

KOH + H₂S = KHS + H₂O

and KHS + KOH = K₂S + H₂O

The fusion of potash with sulfur results in the formation of sulfurated potash, a mixture of potassium polysulfides and thiosulfates, which is used in the preparation of sulfur baths. Potassium sulfide is also used in photography.

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