At 298 K a galvanic cell initially operates under standard conditions

CHEMISTRY · Single correct · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

At 298 K a galvanic cell initially operates under standard conditions. As the reaction quotient

Q

steadily approaches the equilibrium constant

K

, which statement best describes the change in the cell potential

E

? (a)

E

increases in magnitude, reaching a maximum when

Q = K

. (b)

E

remains equal to

E^{\circ}

until

Q = K

, then abruptly falls to zero. (c)

E

decreases in magnitude and becomes zero when

Q = K

. (d)

E

decreases, crosses zero, and becomes negative exactly when

Q = K