docs: def energy_at_conditions(self, pH, V):
          """
          Get free energy for a given pH and V
  
          Args:
              pH (float): pH at which to evaluate free energy
              V (float): voltage at which to evaluate free energy
  
          Returns:
              free energy at conditions
          """
          return self.energy + self.npH * PREFAC * pH + self.nPhi * V