A galvanic cell operates via the reaction with all ionic concentrations initially at 1.0 M

CHEMISTRY · Subjective · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

A galvanic cell operates via the reaction

2\,\text{Al}(s) + 3\,\text{Mn}^{2+}(aq) \rightarrow 2\,\text{Al}^{3+}(aq) + 3\,\text{Mn}(s)

with all ionic concentrations initially at 1.0 M. Two sequential changes are then made: 1. Solid Al(NO

_3

)

_3

is added until [Al

^{3+}

] = 2.0 M. 2. The cathode solution is diluted with water until [Mn

^{2+}

] = 0.25 M. Relative to the original standard-condition potential

E^{\circ}

, is the final cell potential greater than, less than, or equal to

E^{\circ}

? Explain your reasoning in 1–2 sentences.