IGNOU MCH 4 2018 - Give comparison between coulmetric and volumetric titrations.

Question

Give comparison between coulmetric and volumetric titrations.

06 Apr 2018

Answer :

Word Count : 698

COULOMETRIC TITRATIONS

In a coulometric titration the titrant is generated electrochemically by constant current from a proper electrolyte. Coulometric titrations are in many ways similar to volumetric titrations: the concentration of the titrant is equivalent to the generating current, and the volume of the titrant is equivalent to the generating time. The two modes are exemplified with an argentometric titration.

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Titration of chlorides with Ag+: (a) volumetric, (b) coulometric.

Coulometric titrations have numerous advantages

Volumetric titrations

Volumetric or titrimetric analyses are quantitative analytical techniques which employ a titration in comparing an unknown with a standard. In a titration, a volume of a standardized solution containing a known concentration of reactant "A" is added incrementally to a sample containing an unknown concentration of reactant "B". The titration proceeds until reactant "B" is just consumed (stoichiometric completion). This is known as the equivalence point. At this point the number of equivalents of "A" added to the unknown equals the number of equivalents of "B" originally present in the unknown. Volumetric methods have the potential for a precision of up to 0.1%. For volumetric methods to be useful, the reaction must reach 99%+ completion in a short period of time. In almost all cases, a buret is used to meter out the titrant. When a titrant

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