Abstract

Dilute solutions of sodium in liquid ammonia at −78°C were prepared in quartz ampules. Previous work has shown that such solutions react with strongly adsorbed water on the container surface. After allowing the solution to react, the ammonia was pumped off. The residue evolved hydrogen when heated in vacuum. This suggests that the residue contained sodium hydride. Hence, not all the hydrogen formed in the reaction is evolved from the blue solution, but some remains behind chemically combined with sodium.

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