c14 JWBS043-Rogers September 13, 2010 11:27 Printer Name: Yet to Come
234 ELECTROCHEMICAL CELLSone can obtain the following voltages at very small HCl(aq) concentrationsmol dm−^3 Ecell(volts)0.00321 0.5205
0.00562 0.4926
0.00914 0.4686
0.0134 0.4497
0.0256 0.4182Find the standard cell potential of the Ag(s);AgCl(s) half-cell.Problem 14.9
It is proposed to use cerium(III) as a reducing agent in the redox titration of iron(III)
according to the reactionCe^3 +(aq)+Fe^3 +(aq)→Ce^4 +(aq)+Fe^2 +(aq) 1 MH 2 SO 4The half-cell potentials written as reductions are somewhat modified in the strong
acid solution:Ce^4 +(aq),Ce^3 +(aq); Pt is− 1 .44 volts 1 M H 2 SO 4andFe^3 +(aq),Fe^2 +(aq); Pt is 0.68 volts 1 M H 2 SO 4Is this a plausible titration method for further development? If so, why? If not, why
not?