A solution containing Cd 2+ was analyzed voltammetrically using the standard addition method….

A solution containing Cd2+ was analyzed
voltammetrically using the standard addition method. Twentyfive milliliters of
the deaerated solution, which was 1 M in HNO3, produced a net
limiting current of 1.41 µA at a rotating mercury film working electrode at a
potential of 20.85 V (versus SCE). Following addition of 5.00 mL of a 2.50  10-3
M standard Cd2+ solution, the resulting solution produced a current
of 4.93 µA. Calculate the concentration of Cd2+ in the sample.

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