Nernst and Goldman

$$E_r = \frac{RT}{zF} \ln \left(\frac{[\text{Ion}]_\text{out}}{[\text{Ion}]_\text{in}}\right) {\ \ \ \ \ \ \ \ \ \ } E_m = \frac{RT}{F} \ln \left( \frac{P_{\text{K}^+}[\text{K}^+]_\text{out} + P_{\text{Na}^+}[\text{Na}^+]_\text{out} + P_{\text{Cl}^-}[\text{Cl}^-]_\text{in}}{P_{\text{K}^+}[\text{K}^+]_\text{in} + P_{\text{Na}^+}[\text{Na}^+]_\text{in} + P_{\text{Cl}^-}[\text{Cl}^-]_\text{out}} \right)$$

[Na+]out		440		Goldman	Nernst Na+
[K+]out		20		Nernst K+	Nernst Cl-
[Cl-]out		560		T (Kelvin)		273

[Na+]in		50		PNa		10
[K+]in		400		PK		500
[Cl-]in		52		PCl		10