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What is the principle behind using UV-Vis spectroscopy for qualitative analysis?

Practice Questions

Q1
What is the principle behind using UV-Vis spectroscopy for qualitative analysis?
  1. It measures the mass of ions
  2. It detects the color of the solution
  3. It identifies functional groups based on absorbance
  4. It separates ions based on charge

Questions & Step-by-Step Solutions

What is the principle behind using UV-Vis spectroscopy for qualitative analysis?
  • Step 1: Understand that UV-Vis spectroscopy is a technique that uses ultraviolet and visible light to analyze substances.
  • Step 2: Know that different compounds absorb light at specific wavelengths based on their chemical structure.
  • Step 3: Recognize that the amount of light absorbed at these wavelengths is measured as absorbance.
  • Step 4: Learn that the absorbance values can indicate the presence of certain functional groups in the compound.
  • Step 5: Conclude that by comparing the absorbance data to known standards, we can identify the compounds present in a sample.
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