Under standard conditions for all concentrations, the following reaction is spontaneous at 25oC. O3(g) + 2H +

Question:

Under standard conditions for all concentrations, the following reaction is spontaneous at 25oC.
O3(g) + 2H + (aq) + 2Co2+(aq) → O2(g) + H2O(l) + 2Co3+(l)
If [H+] is decreased so that the pH = 9.10, what value will Ecell have, and will the reaction be spontaneous at this [H+]?