Question An unknown Cd2+ solution was analyzed using an electrochemical technique and the method of standard addition. In this method Ip = kC, where Ip (A) is the peak current for the analyte whose concentration is C (moles/L) and K is a proportionality constant. A 25.00 mL aliquot of the unknown yielded a peak current of 0.80 A. After 10.00 mL of a 2.30 x 10 -3M standard Cd2+ solution was added and mixed thoroughly, a measurement gave a value Ip = 2.10 A. Calculate the Molarity of Cd2+ in the original solution. (4 points) 3. Besides the standard additions and internal standard methods, state and describe five other options you might consider to use in trying to reduce matrix interferences in an analytical procedure. (5 points) 4. What parameters would you consider when choosing an analytical method? (5 points) 5. What is a Zener breakdown voltage? How can it be established? (5 points)

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