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Science · Chemistry
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11. (7 pts.) Given below is an infrared spectrum of an authentic sample of acetaminophen, together with a table of peak frequencies as wavenumbers (cm-1) and transmission values for the peaks T). An authentic sample is one that is known to be acetaminophen that is pure and can be used as a comparison sample for identifying an unknown, or in this case, confirming the identity of a sample When comparing spectra, it is the FINGERPRINTREGION that is useful this time. Peaks with vibration frequencies greater than 1500 cm 1 tend to correspond to bonds in functional groups, and although it is possible to identify functional groups using these peaks, it is not possible to determine exactly WHICH SPECIFIC carboxylic acid or ester etc. is present. Peaks with vibration frequencies LOWER than 1500 cm tend to correspond to vibrations that are spread out over more than one bond, and that are not specific to particular functional groups, they are instead specific to SPECIFIC MOLECULES. The peaks in this region are the molecules fingerprint In the table below, the frequencies of TEN of the peaks in the infrared spectrum are summarized together with their T values. Find the corresponding peaks in YOUR SPECTRUM. The frequencies may not be IDENTICAL, due to differences in the way that the spectra were recorded or differences in calibration of the IR spectrometers, but they should be very close. The T values will almost certainly not be identical. Record the exact frequencies of these peaks in your spectrum in the Table together with the 13

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