An amount of cadmium sulphate powder equivalent to 1g/L of cd^2+ was prepared. 10ml of the solution was pipetted into a 100ml volumetric flask containing 25ml of 0.2% gelatin solution and 2M KCl was used to dilute to volume. 5ml of this solution was transfered to a polarographic cell and id(diffusion current)=2.2microAmps was obtained. After adding 10ml of 0.01g/L of solution of cadmium sulphate analar, the id=3.5microAmps. What is the % content of Cd^2+ in the cadmium sulphate? Justify the 0.2% gelatin solution and 2M KCl in this set up.

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