CHM171L / A11 Physical Chemistry Laboratory 2
Quarter S.Y. 2010-2011
Electrochemistry: Determination of Faraday’s Constant
, Palomaria, Ralph Matthew
, Regulacio, Anna Rafaela
Professor, CHM171L/A11, School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology;
CHM171L /A11 , School of Chemical Engineering, Chemistry and Biotechnology, Mapua Institute of Technology
is a branch of chemistry that studies chemical reactions which take
place in a solution at the interface of an electron conductor (a metal or a semiconductor)
and an ionic conductor (the electrolyte), and which involve electron transfer between the
electrode and the electrolyte or species in solution.
If a chemical reaction is driven by an external applied voltage, as in electrolysis, or if a
voltage is created by a chemical reaction as in a battery, it is an
In contrast, chemical reactions where electrons are transferred between molecules are
called oxidation/reduction (redox) reactions. In general, electrochemistry deals with
situations where oxidation and reduction reactions are separated in space or time,
connected by an external electric circuit to understand each process.
Quantitative aspects of electrolysis were originally developed by Michael Faraday in 1834.
Faraday is also credited to have coined the terms
, electrolysis, among many
others while he studied quantitative analysis of electrochemical reactions. Also he was an
advocate of the law of conservation of energy.
Faraday concluded after several experiments on electrical current in non-spontaneous
process, the mass of the products yielded on the electrodes was proportional to the value
of current supplied to the cell, the length of time the current existed, and the molar mass of
the substance analyzed.
In other words, the amount of a substance deposited on each electrode of an electrolytic