Experiment #9: Infrared Spectrometry 1: Sampling Methods and Qualitative Analysis
Corrales, Monique V.
Go, Carleen Jade M.
Ms. Stephanie Chan
February 20, 2014
March 13, 2014 I. Abstract This experiment aims to introduce the different infrared spectrometry sampling techniques and also to identify an unknown solution using qualitative analysis of the solution’s infrared spectra. There are a total of three (3) sample mounting techniques introduced in this experiment namely, the pellet, mull, and film techniques. There are two kinds of samples that are tested—two liquids and one solid. The solid undergoes all three sampling techniques while the liquids undergo just the film technique. Results show that the sampling techniques are effective and accurate in the analysis of compounds.
II. Keywords
1. Spectrometry- the use of the absorption, emission, or scattering of electromagnetic radiation by matter to qualitatively or quantitatively study the matter or to study physical processes
2. Mull-a mixture of a solid substance and oil _______________________________________¬¬¬-______________________________________________ III. Introduction Infrared spectrometry (IR) is vital in Organic and Inorganic Chemistry because it is used to both collect information about a compound’s structure and is also a tool for the analysis of the purity of a compound. [3] In an IR spectrometer, the measured absorption of the varying IR frequencies of a sample that is placed along the path of an IR beam is obtained. The identity and purity of a compound could then be determined because different functional groups absorb specific frequencies of IR radiation. [1] Upon exposure to infrared radiation, sample molecules selectively absorb radiation of specific wavelengths resulting to a change of dipole moment in the sample