	反应
12	$E = - \frac{Δ_{r} G_{T}}{12 F} + \frac{7 * 2.303 R T}{2 F} - \frac{5 * 2.303 R T}{3 F} pH$
13	$E = - \frac{Δ_{r} G_{T}}{12 F} + \frac{2.303 R T}{F} - \frac{5 * 2.303 R T}{6 F} pH$
14	$pH = - \frac{Δ_{r} G_{T}}{8 * 2.303 R T} + \frac{21}{4}$
15	$pH = \frac{Δ_{r} G_{T}}{5 * 2.303 R T} - 6$