9. In standard solutions of sodium fluoride, the electrode potentials of the fluoride-selective electrode were measured relative to the silver chloride reference electrode:
C(F-), mol/l 1.0*10-6 1.0*10-5 1.0*10-4 1.0*10-3 1.0*10-2
E, mV 163 130 74 18 -38
The analyzed sample with a volume of 10.00 ml was diluted with a buffer solution to 100.0 ml and the electrode potential of the fluoride-selective electrode was measured Ex = 12 mV. Calculate the concentration of fluoride ions in the solution.

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