SCH 321: INSTRUMENTAL METHODS OF CHEMICAL ANALYSIS CONTINUOUS ASSESSMENT TEST 1
- Using suitable examples, explain sources of interferences in atomic absorption spectrometry. [6 marks]
- Suggest how the interferences above can be minimized. [2 marks]
- Explain the following techniques as used in chemical analytical techniques:
- Potentiometry
- Polarography [4 marks]
- What are ion selective electrodes? [2 marks]
- Outline the working of the different types of ion selective electrodes. [10 marks]
- Outline the basic features of a nuclear magnetic resonance (NMR) spectrometer. [5 marks]
- Tetramethyl silane (TMS) is used as an internal standard in nuclear magnetic resonance spectroscopy.
- What is chemical shift in NMR spectroscopy. [2 marks]
- Discuss factors affecting chemical shift in proton NMR spectroscopy. [6 marks]
- In a proton NMR spectrum of benzyl alcohol using a 60 MHz instrument, it is observed that the OH signal appears at δ = 2.4. Determine the difference in frequency, expressed in Hz between this signal and TMS signal using the same instrument. [3 marks]
