A) log [H⁺]
B) Ln [H⁺]
C) - log [H⁺]
D) -ln [H⁺]
E) -log $Y$

A) Restore pH to normal following departures
B) Increase the effect of adding acid or base on blood pH
C) Bind up acid if acid is in excess or release acid if base is in excess
D) Equilibrate acids across cell membranes
E) Excrete acid or base via the lungs

A) The pH is much less than the pK
B) The pH is much greater than the pK
C) The pH is near the pK
D) pH is low
E) pH is high