Traces of aniline can be determined by reaction with an excess of electrolytically generated Br2:
The polarity of the working electrode is then reversed, and the excess bromine is determined by a coulometric titration involving the generation of Cu (I):
Suitable quantities of KBr and copper (II) sulfate were added to a 25.0-mL sample containing aniline. Calculate the mass in micrograms of C6H5NH2 in the sample from the accompanying data:
