Consider a galvanic cell based upon the following half reactions: Ni 2+ + 2e - ?

Question

Consider a galvanic cell based upon the following half reactions:

Ni2+ + 2e- ? Ni      -0.27 V
Cr3+ + 3e- ? Cr      -0.73 V

How many of the following responses are true?

1. Adding equal amounts of water to both half reaction vessels will decrease the potential of the cell
2. Increasing the mass of the Ni will change the initial potential of the cell
3. Cr is being oxidized during the reaction
4. Decreasing the concentration of Ni2+ (assuming no volume change) will decrease the potential of the cell
5. Decreasing the concentration of Cr3+ (assuming no volume change) will decrease the potential of the cell

Explanation / Answer

For the given electrochemical cell

True statements would be,

3. Cr is being oxidized during the reaction
5. Decreasing the concentration of Cr3+ (assuming no volume change) will decrease the potential of the cell

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