(Solved): 12. Thioamide drugs, such as that shown here, can be determined by cathodic stripping analysis. Dep ...

12. Thioamide drugs, such as that shown here, can be determined by cathodic stripping analysis. Deposition occurs at $+0.05\mathrm{V}$ versus the SCE. During the stripping step, the potential is scanned cathodically, and a stripping peak is observed at $?0.55\mathrm{V}$. In a typical application a $2.00\mathrm{mL}$ sample of urine was mixed with $2.00\mathrm{mL}$ of a pH 4.78 buffer. Following a 2 minute deposition, a peak current of $0.562?\mathrm{A}$ was measured. A $0.10\mathrm{mL}$ addition of a $5.00?\mathrm{M}$ solution of the thioamide drug was added to the same solution. A peak current of $0.837?\mathrm{A}$ was recorded following the same 2 minute deposition time. Report the drug's molar concentration in the urine sample.