Suppose the concentration of hydroxide ion in the cell is doubled at 298 K. The cell voltage will be — Electrochemistry Chemistry Question

💡 Solution & Explanation

The overall balanced reaction for the hydrogen-oxygen fuel cell is 2H2(g) + O2(g) -> 2H2O(l). The Nernst equation for this overall cell reaction depends only on the partial pressures of hydrogen and oxygen gas. Since hydroxide ions (OH^–) do not appear in the net reaction equation, their concentration does not affect the overall cell voltage.