MODULE 14 Flashcards
Oldest electroanalytical technique
ELECTROGRAVIMETRY
solutions are usually stirred and
heated and the metal is often complexed to improve the quality of the deposit.
ELECTROGRAVIMETRY
Maintains the working electrode potential at a constant value relative to reference electrode.
POTENTIOSTAT
Electrode at which the analytical reaction occurs.
WORKING ELECTRODE
used for over a century for
gravimetric determination of metals.
Electrolytic deposition
determination of lead as lead
dioxide on platinum and of chloride as silver chloride on silver.
Anodic deposition
Second type of Electrogravimetric method also called
“POTENTIOSTATIC METHOD
Potential of the working electrode is
maintained.
CONTROLLED-POTENTIAL
ELECTROGRAVIMETRY
Measurement of electricity in (coulomb) at fixed potential /constant current.
COULOMETRY
measuring the quantity of electricity required to effect a
quantitative chemical or electrochemical reaction and
are based on Faraday’s Law of Electrolysis.
COULEMTRIC METHODS OF ANALYSIS
COULEMTRIC METHODS OF ANALYSIS ARE BASED ON
Faraday’s Law of Electrolysis
The quantity of a substance liberated at an electrode during electrolysis is proportional to the quantity of electricity passing through the
solution.
Faraday’s Law of Electrolysis
consist of Working-Electrode at
which the species to be determined is reduced or oxidized or at which a chemically reactive species is
formed, and a Counter-Electrode.
Electrolysis Cell
involve the generation of a
titrant for a measured length of time.
Constant current methods
rate of flow of electric charge.
CURRENT
