Question

How does pH affect the change in free energy for a reaction?

Answer 1

The change in Gibbs Free Energy for a reaction (ΔGrxn) depends on the concentration of reactants and products, so an increase in pHincreases ΔGrxn if H3O+ is a reactant, and decreases ΔGrxn if H3O+ is a product.

The general relationship between Gibbs Free Energy change for a reaction and the concentrations of reactants and products is

ΔGrxn=ΔG0+RTlnQ

where ΔG0 is the free energy change for the reaction under standard conditions (unit concentrations of reactants and products), and Qis the reaction quotient (actual product concentrations divided by actual reactant concentrations).

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Answer 2

The change in Gibbs Free Energy for a reaction ( ΔGrxn) depends on the concentration of reactants and products, so an increase in pH increases ΔGrxn if H3O+ is a reactant, and decreases ΔGrxn if H3O+ is a product.