What is controlled potential electrolysis? Write its applications.
Controlled Potential Electrolysis
is a technique where either a constant current or constant potential is applied to an two or three comparment electrochemical cell in order to effect a large change in the oxidation state of a species of interest. The amount of charge passed during the electrolysis can be calculated by integrating the current with respect to time.
The principle behind the Controlled Potential Electrolysis (CPE) experiment is very simple. If only the oxidized
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Give the advantages of amperometry.
Given the following reaction half reaction:
Cd2+ + 2e ® Cd E° = - 0.403 V
Pb2+ + 2e-®Pb E° = - 0.126 V
where [Cd2+] = 0.020 M and [Pb2+] = 0.200 M
construct a galvanic cell using half cell reactions and find
i) Which half cell –reaction is the cathode?
ii) Write the cell reaction.
iii) Calculate of this galvanic cell.
iv) Calculate Ecell of this galvanic cell
v) Calculate equilibrium constant using E°cell potentials of this galvanic cell based on the construction of ions.
Write special features of coulometric methods.
List the various types of detector commonly used in measurement of radioactivity. Discuss any one of them in detail.
Give comparison between coulmetric and volumetric titrations.
An impure sample of CaC2O4H2O is analysed using TGA technique. TG curve of the sample indicates the total mass change from 85 mg to 30.7 mg when this sample was heated upto 1173 K. calculate the purity of the sample.
At 291 K, the conductivity of pure water is 4.3 ´ 10-6 S m-1. Calculate the ionic product of pure water at 291 K.
Hint: Consult Table 4.2 for the limiting ionic conductivity of H+ and OH- ions.