Write special features of coulometric methods.
Special Features of coulometric methods
1. Coulometric methods give more accurate and precise results than classical methods since the electrical currents can be controlled and measured with utmost precision.
2. These methods are suited for both routine as well as rare
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List the various types of detector commonly used in measurement of radioactivity. Discuss any one of them in detail.
Distinguish between thermometric and classical titration.
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.
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.
Describe the alternating current methods in voltammetry.
What is controlled potential electrolysis? Write its applications.
A solution of Zn is electrolysed for 30 s using a current if 1.0 mA. Calculate the mass of Zn plated on the electrode for the electrochemical reaction:
Zn2+ + 2e ® Zn