A solid-state fluoride ion-selective electrode responds to F - but not to HF. It also responds to

Question:

A solid-state fluoride ion-selective electrode responds to F^-but not to HF. It also responds to hydroxide ion at high concentration when . Suppose that such an electrode gave a potential of +100 mV (versus S.C.E.) in 10^-5 M NaF and +41 mV in 10^-4 M NaF. Sketch qualitatively how the potential would vary if the electrode were immersed in 10^-5 M NaF and the pH ranged from 1 to 13.