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What is the main principle behind the use of UV-Vis spectroscopy in qualitative

Practice Questions

Q1
What is the main principle behind the use of UV-Vis spectroscopy in qualitative analysis?
  1. It measures the mass of a sample
  2. It detects the presence of specific ions based on their absorbance
  3. It separates components based on their charge
  4. It identifies compounds based on their melting points

Questions & Step-by-Step Solutions

What is the main principle behind the use of UV-Vis spectroscopy in 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.
  • Step 3: When a compound absorbs light, it leaves less light to be detected by the instrument.
  • Step 4: Measure the amount of light absorbed at different wavelengths to create an absorbance spectrum.
  • Step 5: Compare the absorbance spectrum to known spectra to identify the compound present.
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