A solution containing Cd2+ was analyzed voltammetrically by the standard addition method. Twenty-five milliliters of a degassed solution, which was 1M HNO3, produced a net limiting current of 1.78 A at a working electrode of a mercury film at a potential of -0.85 V (against a saturated calomel electrode). After the addition of 5.00 mL of a standard solution of 2.25X10* M of cd* the resulting solution produced a current of 4.48 . Calculate the concentration of Cd* in the sample. R = 2.96X104 M