Traces of aniline can be determined by reaction with an excess of electrolytically generated Br 2 :.

Traces of aniline can be determined by reaction with an
excess of electrolytically generated Br2:

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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:

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