263. Dissolve 0.1 g of metallic zinc containing an admixture of cadmium in 50 ml of hydrochloric acid with a molar concentration equivalent of 6 mol/l and dilute the solution with water to 250 ml. 25 ml of the resulting solution is transferred to the electrolyzer and a polarogram is taken. At a potential of –0.65 V, the height of the cadmium peak was 60 mm. To this solution is added 5 ml of a solution of cadmium chloride with a molar equivalent concentration of 0.00005 mol/l, after which the height of the cadmium peak increases to 140 mm. Determine the content of cadmium in metallic zinc (in %).

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