Chemistry

This is a concentration cell where both electrodes are identical (platinum with hydrogen gas), but at different pressures—so the driving force isn't a chemical difference, but an imbalance in partial pressure. The key insight is that the standard cell potential is zero (same half-reactions), so you'll use the Nernst equation with the pressure ratio to find how much voltage this imbalance creates. Think of it as the system "wanting" to equalize the hydrogen pressure on both sides.

This is a concentration cell where both electrodes are identical (platinum with hydrogen gas), but at different pressures—so the driving force isn't a chemical difference, but an imbalance in partial pressure. The key insight is that the standard cell potential is zero (same half-reactions), so you'll use the Nernst equation with the pressure ratio to find how much voltage this imbalance creates. Think of it as the system "wanting" to equalize the hydrogen pressure on both sides.