ElectrochemistryHard
Question
At equimolar concentrations of Fe2+ and Fe3+, what must [Ag+] be so that the voltage of the galvanic cell made from the (Ag+ | Ag) and (Fe3+ | Fe2+) electrodes equals zero ?
Fe2+ + Ag+ ⇋ Fe3+ + Ag
EoAg+||Ag = 0.7991 ; EoFe2+|Fe2+ = 0.771
Fe2+ + Ag+ ⇋ Fe3+ + Ag
EoAg+||Ag = 0.7991 ; EoFe2+|Fe2+ = 0.771
Options
A.0.34
B.0.44
C.0.47
D.0.61
Solution
0 = (-0.771 + 0.7991) - 
log 
⇒ 0 = 0.0281 + 0.0591 log X
log X = -
⇒ X = 0.335 M
log ⇒ 0 = 0.0281 + 0.0591 log X log X = -
⇒ X = 0.335 M Create a free account to view solution
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