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Why sodium chloride is added during elec...

Why sodium chloride is added during electrolysis of fused anhydrous magnesium chlroride?

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`Na^(+) + e^(-) to Na , Mg^(2+) + 2e^(-) to Mg and Al^(3+) + 3e^(-) to Al`
Ratio of gram atoms of metals liberated using one Faraday = `1/1 : 1/2 : 1/3 = 6 : 3 : 2`
Ratio of weights of metals liberated = `6 xx 23:3 xx 24:2 xx 27 = 23 : 12 : 9.`
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