Potassium Sulfide
Title: Potassium Sulfide
CAS Registry Number: 1312-73-8
Additional Names: Potassium monosulfide
Molecular Formula: K2S
Molecular Weight: 110.26
Percent Composition: K 70.92%, S 29.08%
Literature References: Best prepd from the elements in liq ammonia: Klemm et al., Z. Anorg. Allg. Chem. 241, 281 (1939); Feher in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) pp 360-361.
Properties: White, cubic crystals or fused plates. Discolors in air. Very hygroscopic. Unstable. May explode on percussion or rapid heating. d 1.74. mp 912°. Freely sol in water. Aq solns are strongly alkaline.
Melting point: mp 912°
Density: d 1.74
 
Derivative Type: Pentahydrate
Properties: Colorless rhombs. Odor of hydrogen sulfide. Discolors upon exposure to light and air (yellow to yellowish red). mp 60°. Freely sol in water, alc, glycerol. Insol in ether. Densities of aq solutions at 25° (calcd as % K2S.5H2O): 1.82%: 1.009; 10.90%: 1.049; 21.80%: 1.100; 29.07%: 1.136; 39.97%: 1.192; 50.88%: 1.250; 81.77%: 1.432. Aq solns are very caustic and prone to decompn. See the hydrolysis reactions under Sodium Sulfide.
Melting point: mp 60°
Density: Densities of aq solutions at 25° (calcd as % K2S.5H2O): 1.82%: 1.009; 10.90%: 1.049; 21.80%: 1.100; 29.07%: 1.136; 39.97%: 1.192; 50.88%: 1.250; 81.77%: 1.432

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