1. The table at right is similar to Table 18.1 in that it tabulates standard red

ID: 513511 • Letter: 1

Question

1. The table at right is similar to Table 18.1 in that it tabulates standard reduction voltages of half reactions, but in this case the half reactions involve organic molecules important in biochemistry. Note here that the standard conditions are biochemically standard conditions (E°) where T = 25 °C but [H+] = 10-7 M (much less acidic than the [H+] = 1 M in Table 18.1).

Oxidized form

Reduced form

E°(V)

Glutahione (oxidized) + 2e-

-> Glutathione(reduced)

-0.23

Fumarate + 2e-

-> Succinate

0.03

Ubiquinone (oxidized) + 2e-

-> Ubiquinone (reduced)

0.10

½ O2 + 2H+ + 2e-

-> H2O

0.82

(a) Identify the strongest reducing agent from this table.

(b) Identify the strongest oxidizing agent from this table.

(c) Compare the E° for the oxygen half reaction to the same half reaction in Table 18.1. Under which conditions, high pH or low pH is oxygen a stronger oxidizing agent?

Please and answer all these questions! Thank you!