Title: Potassium Selenide
CAS Registry Number: 1312-74-9
Molecular Formula: K2Se
Molecular Weight: 157.16
Percent Composition: K 49.76%, Se 50.24%
Literature References: Prepd by heating selenium with excess potassium: Fonzes-Diacon, Contribution a l'Etudes des Séléniures Métalliques, Montpellier (1901); by adding selenium to a soln of potassium in liq ammonia: Hugot, Recherches sur l¢Action du Sodammonium et du Potassammonium sur Quelque Métalloides, Paris (1900); Feher in Handbook of Preparative Inorganic Chemistry vol. 1, G. Brauer, Ed. (Academic Press, New York, 2nd ed., 1963) p 421; by igniting potassium selenite or selenate in an atm of hydrogen: Berzelius, cited in Mellor's vol. 10, 767 (1930).
Properties: Crystalline mass. d 2.29. Reddens on exposure to air. Turns brownish-black when heated. Deliquescent. Forms potassium selenite with selenious acid. Forms potassium hydroselenide with hydrogen selenide. Sol in water; insol in ammonia.
Density: d 2.29
Derivative Type: Nonahydrate
Properties: Needle-like cryst. Freely sol in water.
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