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Chemistry LibreTexts

2: Ultraviolet/Visible Absorption Spectroscopy

  • Page ID
    111360
  • Learning Objectives

    After completing this unit the student will be able to:

    • Compare and contrast atomic and molecular spectra.
    • Explain why atomic spectra consist of lines whereas molecular spectra at room temperature are broad and continuous.
    • Justify the difference in molecular spectra at room temperature and 10 K.
    • Describe the cause of Doppler broadening.
    • Determine the effect of conjugation on a UV/Vis absorption spectrum.
    • Determine the effect of non-bonding electrons on a UV/Vis absorption spectrum.
    • Determine the effect of solvent on the energy of \(n-pi^*\) and \(\pi-\pi^*\) transitions.
    • Evaluate the utility of UV/Vis spectroscopy as a qualitative and quantitative method.
    • Describe a procedure by which UV/Vis spectroscopy can be used to determine the pKa of a weak acid.

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