Question

Consider a cell based on the following line notation at 298 K:

Cu | Cu²⁺ (0.289 M) || Ni²⁺ (1.25 M) | Ni

Given:

Cu²⁺ + 2 e^- → Cu E^o = 0.34 V
Ni²⁺ + 2 e^- → Ni E^o = -0.23 V

How many of the following responses are true?

1. Using a Pt electrode in place of the Cu electrode will not change the potential of the cell
2. Reduction takes place at the cathode
3. Adding equal amounts of water to both half reactions will not change the potential of the cell
4. Increasing the concentration of the Ni²⁺ will decrease the potential of the cell
5. Increasing the concentration of the Cu²⁺ will decrease the concentration of the reaction