CHM439: SOLUTION TO CHALLENGES ON ANALYTICAL METHOD OF ANALYSIS II

By | October 21, 2019

CHM 439 ANALYTICAL CHEMISTRY II (COURSE OUTLINE)
  • Potentiometric and pH methods.
  • Conducto metric methods.
  • Electroanalytical methods.
  • Radiochemical methods.
  • Chromatography and solvent extraction.
  • Amperometry, voltametry, potentiometry and coulometry.

MATERIAL ONE : WHAT YOU SHOULD KNOW

PART A

                                                               ANALYTICAL METHOD OF ANALYSIS II
– Draw three (3) possible hypothetic curves for voltametric analysis
– In which of the curves is peak wave obtained and why?
– Differentiate between working and reference electrode
– Why is supporting electrolyte introduced into the analyte during voltametric analysis?
– Explain separative techniques (2 marks)
– List all the methods of separative techniques (2 marks)
– The solubility of an organic substance A in ether is 2 times the solubility in water and 40 g of
A is present in 50g of its aqueous solution. If it is shaken with 200 g of ether, how much of A will be transferred into ether layer?
– Explain the source of potential difference when current is generated
– Write brief notes on the differences between the following terms:

. Voltaic cell and Electrolytic cell
. Anode and Cathode
. Electrode potential, E and Standard electrode potential, E°
. Potentiometry and Voltametry
– Calculate the cell potential (voltage) and write the overall reaction for a galvanic cell whose half-cell reactions and Standard potentials are given as:
Fe3+ + e- ————> Fe 2+ Eo = +0.771V
l3- + 2 e- ————> 3l- E=+0.5355V
– Write brief notes on the principles and instrumentation of potentiometry as analytical method
– List all classes of membrane electrodes. Provide specific examples of each class
Given that the standard potential of the calomel electrode is 0.268V and that of the Hg/ Hg electrode is +0.789V, calculate the Ksp for calomel HgCl2
– What are the general types of radioanalytical techniques? Briefly discuss any one of them
– Explain chromatogram
– Differentiate clearly between strong and weak mobile phases
– List chromatographic development processes and explain any one of them
– An extraction with 100 ml portion of ether removed 85 % of the solute X from 100 ml of aqueous solution of M.
.Calculate the distribution fraction (s) in the organic phase
. Calculate the distribution fraction (e) in the aqueous phase
. Determine the distribution coefficient ( D) of the solute
– State the Nernst distribution law, what is the condition for successful application of this
law?
– Briefly discuss the theoretical basis of separation by adsorption
– How many types of radioactive rays do we have? List and explain them
– Radioactive radiations produce excitation and ionization in the medium through which they pass, mention three instruments developed based on these facts and explain how any two that can be used for detection and measurement of radioactivity.

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