# How does pH affect the Nernst equation?

##### 1 Answer

pH doesn't affect the Nernst equation.

But the Nernst equation predicts the cell potential of reactions that depend on pH.

If H⁺ is involved in the cell reaction, then the value of

For the half-reaction, 2H⁺ + 2e⁻ → H₂,

According to the Nernst equation,

If

**EXAMPLE**

Calculate the cell potential for the following cell as a function of pH.

Cu²⁺(1 mol/L) + H₂(1 atm) → Cu(s) + 2H⁺(aq)

**Solution**

Cu²⁺ + 2e⁻ → Cu;

H₂ → 2H⁺ + 2e⁻;

Cu²⁺ + H₂ → Cu + 2H⁺;