Question

What are the advantages and disadvantages of infrared spectroscopy?

Answer 1

Hint: Infrared spectroscopy or IR spectroscopy or vibrational spectroscopy is basically the measurement of the interaction of infrared radiation with matter mainly through absorption, emission or reflection.

Complete answer:
Infrared Spectroscopy is used to identify the chemical substances and functional groups in solid, liquid or in the gaseous forms. The technique of infrared spectroscopy is conducted by using an instrument known as infrared spectrometer or spectrophotometer which produces infrared spectrum.
Applications of IR Spectrometry:
Infrared spectrometry can be applied to the quantitative and qualitative determination of all types of molecular species.
The most used region for IR spectrometry is the mid infrared.
Some advantages of quantitative IR analysis are:
The application of IR spectroscopy as an analytical tool varies a lot from one lab to another.
The quantitative IR analysis is based on the famous Beer’s Law.
The apparent deviation in IR analysis arises either from chemical or the instrumental defects.
The transmittance speed is generally measured at the maximum absorption point.
Most of the possible errors that might cause issue if we have used other techniques are eliminated easily by the baseline method.
For all the determinations, the same cell is used.
Some disadvantages of quantitative IR analysis are:
We cannot find the molecular mass of a substance using the IR spectroscopy technique.
Because of the narrowness of spectra and the effect of stray radiations, it makes the measurement of absorbance upon a slit width.
The IR spectroscopy, in general, does not provide any information about the relative positions of different functional groups of a molecule.

Note:
The far infrared region is used to determine the structures of inorganic and metal-organic structures. Also, liquid, solutions, pastes, powders, films, fibres, gases and surfaces can all be examined with this technique that is Infrared spectroscopy.