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Chemistry LibreTexts

2: Ultraviolet/Visible Absorption Spectroscopy

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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 npi and ππ 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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This page titled 2: Ultraviolet/Visible Absorption Spectroscopy is shared under a CC BY-NC 4.0 license and was authored, remixed, and/or curated by Thomas Wenzel via source content that was edited to the style and standards of the LibreTexts platform.

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