The potential of the electrode with respect to a Ag/AgCl(sat’d) reference electrode after addition of different volumes of Cerium(IV) should be calculated.
Nernst equation gives the cell potential under non-standard conditions.
E − cell potential
E0 − standard cell potential
R − universal gas constant
T − temperature in Kelvin
n − number of electrons transferred
F − Faraday constant
Q − Reaction quotient
A titration curve should be constructed
Potentiometric titration is similar to direct redox titrations but in potentiometric titrations no indicator is used. Instead, the potential is measured during the titration to obtain the equivalence point.
A first and second derivative curve for the data should be generated.
The first derivative curve of the potentiometric titration is plotted between and average volume of titrant added. The second derivative curve is plotted between and average volume of titrant added. By generating derivative curved one can obtain the equivalence point accurately.
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