Reference: Pavia, Techniques 25.1-2, 25.5A, 25.7, and 25.9-14 Use the word bank

Question

Reference: Pavia, Techniques 25.1-2, 25.5A, 25.7, and 25.9-14 Use the word bank to answer the following questions from the guided reading assignment. D. W E. Dry film I. Soluble K. Ionic 1. Any compound having bonds will be found to absorb frequencies of eleetromagnetic radiation in the infrared region of the spectrum. This is why glass, quartz, and plastic cannot be used as sample cells 2- 3. Salt plates are often used for sample cells because they contain bonds. These types of bonds are not 4. Liquid samples must be dry before taking a spectrum using sodium chloride sample cells because the salt 5 The method of preparing solids for use with sodium chloride sample cells requires first dissolving the The vibrational infrared spectrum region can be expressed in units of cr', called absorbed in the infrared region of the spectrum. plates are water led solid in a volatile organic solvent. The FT-IR instruments used in the CHM 313Li4L program use an attenuated total reflectance (ATR) accessory. Sample preparation is simpler with this accessory because a small amount of liquid or solid is placed directly on the . 6. 7. A "neat" spectrum refers to one that is taken of a liquid, no solvent is used 8. When recording the spectrum, the sample, the solvent, the type of cell or method used, and any other Note: In the CHM pertinent information must be written on the 313L/314L program, the sampl sample must be labelled with the corresponding functional group. immediately after the determination. le name and structure must be shown and any peaks that characterize the

Explanation / Answer

1.Any compound having COVALENT bonds will be found to absorb frequency of electro magnetic radiation in the infrared region of spectrum, this why glass,quartz and plastic can not be used as sample cells.

2.The vibrational infrared spectrum region can be expressed in units of Cm-1 called WAVE NUMBER.

3.Salt plates are often used for sample plates because they contain IONIC bonds.These type of bonds are not absorbed in infrared region of spectrum.

4.Liquid samples must be dry before taking a spectrum using sodium chloride sample cells because the salt plates are water SOLUBLE.

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