What is the main principle behind the use of UV-Vis spectroscopy in qualitative analysis?
Practice Questions
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Q1
What is the main principle behind the use of UV-Vis spectroscopy in qualitative analysis?
It measures the mass of a sample
It detects the presence of specific ions based on their absorbance
It separates components based on their charge
It identifies compounds based on their melting points
UV-Vis spectroscopy identifies compounds by measuring their absorbance at specific wavelengths, which correlates with the presence of certain ions.
Questions & Step-by-step Solutions
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Q
Q: What is the main principle behind the use of UV-Vis spectroscopy in qualitative analysis?
Solution: UV-Vis spectroscopy identifies compounds by measuring their absorbance at specific wavelengths, which correlates with the presence of certain ions.
Steps: 5
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.
