Answer to Question #327798 in Chemistry for nicole

Question #327798

Chloroform is an internal standard in the determination of the pesticide DDT in a          polarographic analysis in which each compound is reduced at an electrode surface.                  A mixture containing 0.500 mM chloroform and 0.800 mM DDT gave signals of                    15.3 µA for chloroform and 10.1 µA for DDT. An unknown solution (10.0 mL)             containing DDT was placed in a 100‐mL volumetric flask and 10.2 µL of chloroform               (FM 119.39 g/mol, density = 1.484 g/mL) were added. After dilution to the mark with         solvent, polarographic signals of 29.4 and 8.7 µA were observed for the chloroform             and DDT, respectively.  (a) Identify the analyte, the technique and the type of signal used.                                   (3) (b) Find the concentration of DDT in the unknown. 


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