Ncert Exercises & Solutions

9.32 How can saline hydrides remove traces of water from organic compounds?

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:

$A H_{(s)} + H_{2} O_{(I)} \to A O H_{(a q)} + H_{2 (g)}$

(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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