Distinguish between thermometric and classical titration.
Thermometric titration
A thermometric titration is one of a number of instrumental titration techniques where endpoints can be located accurately and precisely without a subjective interpretation on the part of the analyst as to their location. Enthalpy change is arguably the most fundamental and universal property of chemical reactions, so the observation of temperature change is a natural choice in monitoring their progress. It is not a new technique, with possibly the first recognizable thermometric titration method reported early in the 20th century (Bell and Cowell, 1913). In spite of its attractive features, and in spite of the considerable research that has been
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How do nuclear reactions differ from chemical reactions, discuss briefly.
Give the advantages of amperometry.
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 isotope dilution analysis.
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.
Describe the alternating current methods in voltammetry.
At 298, the limited molar conductivity at infinite dilution of sodium benzoate, hydrochloric acid and sodium chloride are 8.24 ´ 10-3 S m2 mol-1, 4.26 ´ 10-2 S m2 mol-1 and 1.26 ´ 10-2 respectively. Calculate the limiting molar conductivity of aqueous benzoic acid.