The efficiency of an anionic exchanger towards the fluoride ion was measured usi

Question

The efficiency of an anionic exchanger towards the fluoride ion was measured using a fluoride selective electrode. The anionic exchanger is used to remove the fluoride ions from solution. Before a solution of 1.00x10^-3 M fluoride was exposed to the anionic exchanger, an ion selective electrode was immersed in the solution and a voltage of .214 V was measured. The exchanger was added to the solution, stirred for a period of time and then removed from the solution. Using the ion selective electrode, the voltage of the solution was measured to be .350 V, afrer removing the anionic exchanger. What was the concentration of fluoride after treatment with the exchanger?

Explanation / Answer

Ecell = E0cell - 0.0591 log[F-]

Now,

0.214 = E0cell - 0.0591log(0.001)

0.214 = E0cell + 0.1773

E0cell = 0.0367 V

Now,

0.35 = 0.0367 - 0.0591log[F-]

log[F-] = -5.3011

[F-] =

concentration of fluoride after treatment with the exchanger after the exchanger is 4.998 x 10^-6 M

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