The free energy of a reaction which is not at equilibrium, such as is the case i

Question

The free energy of a reaction which is not at equilibrium, such as is the case in nearly all cellular reactions, involves two terms: the standard free energy at equilibrium and a term expressing the deviation of the actual conditions from equilibrium. In the Henderson-Hasselbalch equation governing buffers, the equivalent of the standard free energy term occurs at the pH at which

A. the weak acid is fully dissociated.

B. the weak acid is fully in the undissociated form

C. the pH=pI

D. half the weak acid is dissociated

E. none of the above

The answer is D. Please explain how you can obtain this answer

Explanation / Answer

D. half the weak acid is dissociated

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