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

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Question: What is the main principle behind the use of UV-Vis spectroscopy in qualitative analysis?

Options:

Correct Answer: It detects the presence of specific ions based on their absorbance

Solution:

UV-Vis spectroscopy identifies compounds by measuring their absorbance at specific wavelengths, which correlates with the presence of certain ions.

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

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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