Traces of aniline can be determined by reaction with an excess of

Chapter 24, Problem 24-11

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Traces of aniline can be determined by reaction with an excess of electrolyticallygenerated Br,:c"HsNH, + 3Br, --> c"H,Br)NH, + 3H' + 3BrThepolarity of the working electrode is then reversed, and the excess bromine isdetermined by a coulometric titration involving the generation of CU(I):Br2 + 2Cu' --> 2Br- + 2Cu2+Suitable quantities of KBr and copper(II) sulfate were added to a '25.0-mLsample containing aniline. Calculate the mass in micrograms of C6HsNH2in thesample from the accompanying data:WorkingElectrodeFunctioning AsGeneration Time (min)with a Constant Currentof 1.00 mAAnodeCathode3.760.270

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