In the context of the lab procedure, what is the main reason for collecting IR spectra?

Collecting IR (Infrared) spectra is primarily used to identify the reaction progress in organic chemistry. The technique allows chemists to analyze the functional groups present in the reactants and products by observing the absorption of infrared light at specific wavelengths. As a reaction progresses, certain peaks corresponding to functional groups may disappear while others appear, indicating the transformation of reactants into products. This comparison helps to assess whether the reaction has proceeded to completion or if further reactions are needed.

While measuring pH, determining boiling points, and assessing safety hazards are important aspects of laboratory work, they do not utilize IR spectroscopy. Instead, pH measurements typically involve using pH indicators or meters, boiling points are determined through distillation or other methods, and safety hazards are usually evaluated through chemical safety data sheets and risk assessments. Thus, the use of IR spectra is specifically associated with tracking changes in chemical structure and functional groups, making it a crucial tool for monitoring reaction progress.