Under standard conditions for all concentrations, the following reaction is spontaneous at `25^@C`.
`O_2(g) + 4H^(+)(aq) + 4Br^(-) (aq) to 2H_2O (l) + 2Br_2(l) , E^@ = 0.17V`
If `[H^+] ` is adjusted by adding a buffer of 0.10 M NaOCN and 0.10 M HOCN `(K_a = 3.5 xx 10^(-4))` , what value will `E_("cell")` have, and will the reaction be spontaneous at this `[H^+]` ?

Explanation

-0.042 V, No