A student investigates three different metal–ion combinations for possible use in a…
CHEMISTRY · Multi-part · A Level · Chemistry · Electrode potentials · Electrode potentials
Problem
A student investigates three different metal–ion combinations for possible use in a battery. For each combination, the student measures the standard cell potential once per minute for five minutes immediately after assembling fresh galvanic cells at 298 K. The recorded potentials are summarized below.| Time after assembly (min) | Cell X (V) | Cell Y (V) | Cell Z (V) |
|---|---|---|---|
| 0 | +0.91 | –0.04 | +0.18 |
| 1 | +0.89 | –0.02 | +0.17 |
| 2 | +0.88 | –0.01 | +0.15 |
| 3 | +0.87 | 0.00 | +0.13 |
| 4 | +0.85 | +0.01 | +0.12 |
| 5 | +0.84 | +0.02 | +0.11 |