Problem: Which of these changes will produce the most positive voltage for this half reaction in the direction written? Co2+ (aq) + 2e– → Co(s)      E° = –0.28 V a) increasing the amount of solid Co b) decreasing the amount of solid Co c) increasing the concentration of Co2+ d) decreasing the concentration of Co2+    

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Which of these changes will produce the most positive voltage for this half reaction in the direction written?

Co2+ (aq) + 2e → Co(s)      E° = –0.28 V

a) increasing the amount of solid Co

b) decreasing the amount of solid Co

c) increasing the concentration of Co2+

d) decreasing the concentration of Co2+

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