Extraction of Metals - Result Question 84

####87. Give briefly the isolation of magnesium from sea water by the Dow’s process.

Give equations for the steps involved.

(1993,3M)

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Solution:

  1. Sea water (contain MgCl2)+Ca(OH)2

Mg(OH)2+CaCl2(aq)

(i) Mg(OH)2+2HClMgCl2+2H2O

 Dryness  Heat to MgCl2(s)

(ii) MgCl2(s)NaCl Fusion Mg2++2Cl electrolysis Mg

(At cathode)



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