Which of the following conditions are among the requirements for a Nernst equilibrium potential to exist for a given charged ion species across a semipermeable membrane as in an ion-selective electrode?
A) The semipermeable membrane must be permeable to many ion species.
B) A concentration gradient for a given charged ion species must exist across that membrane.
C) If a membrane is permeable to two different ion species,then the ion activity of both species can be measured.
D) The membrane potential across a semipermeable membrane must be constantly changing.
Correct Answer:
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