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Calcium Amide, Ca(NH2)2

When calcium ammonium is kept at ordinary temperatures, even in contact with ammonia, it slowly decomposes, giving transparent crystals of calcium amide, Ca(NH2)2.

By the action of hydrogen on calcium nitride at 300° C., Dafert and Miklauz obtained another amide to which they gave the formula Ca3(NH2)2.

A number of substituted amides have been prepared by the action of organic amino-compounds on calcium, for example, calcium anilide, Ca(C6H5NH)2, calcium ortho- and para-tolylamide, Ca(C7H7NH)2, calcium diphenylamide, Ca(Cl2H10N)2, and so on.

By the action of potassamide on a calcium salt in ammonia solution a white, amorphous, microcrystalline precipitate is obtained. It is insoluble in liquid ammonia but is dissolved and decomposed by a solution of ammonium nitrate in liquid ammonia, and is hydrolysed by water with the production of calcium hydroxide and ammonia. Franklin regarded it as CaNK.2NH3, and called it potassium ammonocalciate. The formula might also be written as that of a molecular compound of the two amides Ca(NH2)2.KNH2. If there is no excess of potassamide, calcium amide only is formed.

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