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Question
How can saline hydrides remove traces of water from organic compounds?
Solution
Saline hydrides are ionic in nature. They react with water to form a metal hydroxide along with the liberation of hydrogen gas. The reaction of saline hydrides with water can be represented as:
\[\ce{AH_{(s)} + H_2O_{(l)} -> AOH_{(aq)} + H_2{(g)}}\]
(where, A = Na, Ca,……)
When added to an organic solvent, they react with water present in it. Hydrogen escapes into the atmosphere leaving behind the metallic hydroxide. The dry organic solvent distills over.
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