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Explain how potentiometry and coulometry differ. Sketch example data on how each could be used to...

Explain how potentiometry and coulometry differ. Sketch example data on how each could be used to measure the copper ion concentration in solution. For each, would they measure the free or total concentration of the ion (assume that any complex formation is reversible.

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Answer #1

In potentiometry the potential difference is measured through which concentration of the analyte
can be known where as in collometry current and time taken for the reaction are measured
and related to the potential through which concentration can be found out.
Using Nernst we can find concentration using potential directly in Potentiometric method.
Copper anode and hydrogen cathode is employed for this purpose.
For coulometry Q = it is used since current and time taken for oxidation/reduction is measured
to know the concentration. For 100 % reaction completion all of the current is used.
Free ion concentration is measured mostly using potentiometry while total ion concentration
is used for coulometry because time is measured to know the completion of reaction in coulometry.




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