Coulometry Essay
Malabanan, Mary Joyce L.
ICE-4101
Electroanalytical Chemistry
Topic: Coulometry
Coulemetry is the given to a group of techniques in analytical chemistry that determine the amount if matter transformed during an electrolysis reaction by measuring the amount of electricity (in coulombs) consumed or produced. It is named after Charles-Augustin de Coulomb.
There are two basic categories of coulometric techniques, Potentiostatic coulometry and Coulometric titration or amperostatic coulometry.
In electrogravimetry, the product of electrolysis is weighed as a deposit on one of the electrodes. In the other two methods, the quantity of electricity needed to complete the electricity serves as a measure of the amount of analyte present.
The quantity
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The controlled variable in a potentiostat is the cell potential and the measured variable is the cell current.
Instrumentation
Working electrode is the electrode where the potential is controlled and where the current is measured. For many physical electrochemistry experiments, the working electrode is an “inert” material such gold, platinum or glassy carbon. In these cases, the working electrode serves as a surface on which the electrochemical reaction takes place.
Reference electrode is used to measure the working electrode potential. A reference electrode should have a constant electrochemical potential as long as no current flows through it. The most common lab reference electrodes are the saturated calomel electrode (SCE) and the silver/silver chloride (Ag/AgCl) electrodes.
Counter (Auxiliary) Electrode is conductor that completes the cell circuit. The counter electrode in lab cells is generally an inert conductor like platinum or graphite. In field probes, it is generally another piece of the working electrode material. The current that flows into the solution via the working electrode leaves the solution via the counter
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