Mercury electrodes were pretty popular until they were found to be horribly toxi
ID: 825357 • Letter: M
Question
Mercury electrodes were pretty popular until they were found to be horribly toxic. Consider the Hg0electrochemical reaction
2Hg (l) + Fe(+2) (aq) + SO4 (-2) (aq) --> Hg2SO4 (s) + Fe (s) E' = -1.06 V
a) The following parameters were used to construct a cell at 298 K:
Chemical..............Concentration (mol/L)
FeCl2.....................0.100
Na2SO4.................0.100
The cell potential with the above conditions is -1.1302V. Using the Nernst equation
(E = E' - (RT/nF)ln(a_{prod}/a_{react}))
Dervive the value of the mean activity coefficient of Fe(+2), gamma +/- (hint: n=2)