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How can spectroscopy be used as a qualitative analysis technique?

Answer 1

See explanation below.

Spectroscopy could be used as a qualitative analysis technique by monitoring a particular characteristics of products or reactants in a chemical reaction.

For example, infra-red ( IR ) spectroscopy, nuclear magnetic resonance ( NMR ) or ultraviolet-visible spectrophotometer ( UV-Vis ) could be used to monitor the appearance of a product or disappearance of a reactant.

In IR and NMR, we look for the appearance of a new peaks for products or reducing the intensity or disappearance of a particular peaks for a reactant.

Using UV-Vis spectrophotometer, we can look for new absorption wavelengths that are particular to a product, and so on.

I hope this helps.

Here is a video where we have used a spectrophotometer to monitor the progress of a reaction:

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Answer 2

Addison Armstrong

Spectroscopy can be used as a qualitative analysis technique by identifying the presence of specific functional groups or compounds based on their characteristic absorption or emission spectra.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.