Sodium

         (1) The ores of sodium : NaCl(common salt), NaNO₃ (chile salt petre), Na₂SO₄.10H₂O (Glauber's salt), borax (sodium tetraborate or sodium borate, (Na₂B₄O₇. 10 H₂O).

         (2) Extraction of sodium : It is manufactured by the electrolysis of fused sodium chloride in the presence of CaCl₂ and KF using graphite anode and iron cathode. This procedure is called as Down process.

         Sodium cannot be extracted from aqueous NaCl because (-0.83V) is more than(-2.71V).

         The anode and cathode are separated by the means of a wire gauze to prevent the reaction between Na and Cl₂ .

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