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

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