4. Construct a galvanic cell with which you can determine the average ionic activity and the average ionic activity coefficient of the electrolyte in an aqueous solution of ZnCl2 with a concentration m1 = 0.02. Write down the equation of electrode half-reactions and the equation of spontaneous chemical reaction taking place in the proposed galvanic cell. Obtain expressions for calculating the average ionic activity and average ionic coefficient of the electrolyte.

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