Traces of aniline can be determined by reaction with an excess of electrolytically generated Br2:   C6H­5NH2      + 3Br2   =====è   C6H2Br3NH2   +  3H+   +  3Br- 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):                 Br2   +  2Cu+  ===è  2Br-   + 2Cu2+ Suitbale quantities of KBr and copper (II) sulfate were added to a 25.0 ml sample containing aniline (C6H5NH2). Calculate the mass in micrograms of C6H5NH2 in the sample from the accompanying data.   Working electrode Functioning as   Generation Time (min) with a constant current of 1.00 mA Anode 3.76 cathode 0.270

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

 

C65NH2      + 3Br2   =====è   C6H2Br3NH2   +  3H+   +  3Br-

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):

                Br2   +  2Cu+  ===è  2Br-   + 2Cu2+

Suitbale quantities of KBr and copper (II) sulfate were added to a 25.0 ml sample containing aniline (C6H5NH2). Calculate the mass in micrograms of C6H5NH2 in the sample from the accompanying data.

 

Working electrode Functioning as

 

Generation Time (min) with a constant current of 1.00 mA

Anode

3.76

cathode

0.270

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