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Q. 14.4

Chapter 14

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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