## Q. 14.4

Response of an Ion-Selective Electrode

When a fluoride electrode was immersed in standard solutions (maintained at a constant ionic strength of 0.1 M with $NaNO_{3}$), the following potentials (versus S.C.E.) were observed:

 $[F^{−}]$ (M) E(mV) 1.00 × $10^{−5}$ 100.0 1.00 × $10^{−4}$ 41.5 1.00 × $10^{−3}$ −17.0

Because the ionic strength is constant, the response should depend on the logarithm of the $F^{−}$ concentration. Find $[F^{−}]$ in an unknown that gave a potential of 0.0 mV.

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