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(a)Brine usually contains soluble calcium and magnesium salts. Explain how sodium carbonate is used to purify brine.
(b) The diagram below represents a diaphragm cell used to electrolyse pure brine
(i) Write the equations for the reactions that take place at I.Cathode II. Anode
(ii) Name: I. product at U.
II. another material that can be used instead of titanium
III.the impurity present in the product at U.
(iii) State two functions of the diaphragm
(c ) Give one industrial use of the product at U.