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Electrochemistry notes
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Prof KD Modibane1
, ELECTROCHEMICAL METHODS
• After studying this topic student should be able to :
– Define electrochemical methods
– Describe principle of electrochemistry
– Explain major components of electrochemistry
techniques and their functions
– Explain application of electrochemical methods
– Explain factors affecting function of
electrochemistry
– Describe advantages & disadvantages of
electrochemical characterization technique.
2
, ELECTROANALYTICAL METHODS
Electroanalytical methods- a class of techniques in analytical chemistry, which
study an analyte by measuring the potential (volts),
charge (coulombs) and/or current (amperes) in an
electrochemical cell containing the analyte.
(Discuss how electroanalytical techniques differ with other analytical techniques
and their advantages over them)
Analytical chemistry- deals with quantitative and qualitative analysis
Analyte- species in question or to be analysed.
Electrochemical cell- consists of electrodes connected together by
conducting wire immersed in an electrolyte.
3
, ELECTROCHEMISTRY
• Electrochemistry
– area of chemistry that deals with interconversion of chemical and
electrical energy
– involves redox reactions
• electron transfer reactions
– direct redox reaction
• Oxidizing and reducing agents are mixed together
– Indirect redox reaction
• Oxidizing and reducing agents are separated but connected
electrically
– Example
• Zn and Cu2+ can be reacted indirectly
• Basis for electrochemistry
• Electrochemical cell
4
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