Question

When a fluoride electrode was immersed in standard solutions (maintained at a constant ionic strength of 0.1 M with NaNO₃), the following potentials (versus S.C.E.) were observed:

Concentration of F− (mM)	E (mV)
1.00 x 10−2	100.0
1.00 x 10−1	41.5
1.00	-17.0

Because the ionic strength is constant, the response should depend on the logarithm of the F⁻ concentration. Find the concentration of F⁻ (in mM) in an unknown that gave a potential of 22.4 mV. (Keep two sig. fig. in your final answer.)

Answer 1

The table shows concontrsation Fs potential va tuhan tho uncroon olution Potential 22-ymv (F /0 F-=0,873