In fluoride ion electrode, the potential corresponding to level

in-fluoride-ion-electrode-the-potential-corresponding-to-level

In fluoride ion electrode, the potential corresponding to level of the fluoride ion is described by which of the following equations when E is the measured electrode potential, Eo is the reference potential and A is the level of fluoride ions in solution?

A. E=Eo+0.0591 log A

B. E=Eo-0.0591 log A

C. E=Eo+0.0896 log A

D. E=Eo-0.0896 log A

This question was posed to me in an online quiz.

My question is from Ammonia and Fluoride Electrode in division pH Meters and Ion Analysers of Analytical Instrumentation

The correct answer is B. E=Eo-0.0591 log A

Easiest explanation: In fluoride ion electrode, the potential corresponding to level of the fluoride ion is described by the equation, E=Eo-0.0591 log A. A is the activity or effective concentration of fluoride ions.