(b) Traces of aniline, C6H5NH?, in drinking water can be determined by reaction with an excess of electrolytically generated Br?: 3 B?? + NH? aniline 12 Br NH? Br -Br + 3H* +36 The polarity of the working electrode is then reversed, and the excess Br? is determined by a coulometric titration involving the generation of Cu(I): Br? + 2Cut Suitable quantities of KBr and CuSO4 were added to a 25.0-m² sample containing aniline. ->> 2Br + 2Cu²+

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(b) Traces of aniline,

C_{6} H_{5} NH_{2}

, in drinking water can be determined by reaction with an excess of electrolytically generated

Br_{2}

: The polarity of the working electrode is then reversed, and the excess

Br_{2}

is determined by a coulometric titration involving the generation of

Cu (I)

:

Br_{2} + 2 Cu^{+} ? 2 Br^{?} + 2 Cu^{2 +}

Suitable quantities of

KBr

and

CuSO_{4}

were added to a 25.0-m 2 sample containing aniline Calculate (correct to 3 sig figs) the mass of

C_{6} H_{3} NH_{2}

(in micrograms) in the sample using the data in Table 4.2 above.

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