Aspirin is a drug that is usually used to relieve minor aches and pain and other medical uses such as anti-inflammatory medication. Aspirin Synthesis and Analysis Revised: 12/13/14 • Crush an aspirin tablet and place in a labeled, pre-weighed vial or test tube. Place approximately 200 mL of water into a 400 mL beaker and allow to warm to 70°C on a hot plate Further Analysis When was aspirin first synthesized, by whom, and for … The aspirin will be characterized by three methods: melting point analysis, Fourier transform infrared spectroscopy (FTIR), … After aspirin synthesis was complete, the aspirin was analyzed using both IR and NMR spectrometers in order to determine the hydrogen atoms and organic functional groups present in the synthesized aspirin and to verify the overall identity of the aspirin. Question: Organic Chemistry I: Synthesis Of Aspirin PURPOSE OF THE EXPERIMENT Synthesize Acetylsalicylic Acid. The table below lists NMR standards from several NMR spectra of functional group chemicals: NMR peak for functional groups (PPM range). Aspirin (acetylsalicylic acid) was synthesized by reacting salicylic acid and acetic anhydride with the aid of phosphoric acid as a catalyst. The moles of aspirin used was calculated and incorporated into a calculation of the average concentration of NaOH (mol/L) using the second and third trial amounts of NaOH. Looking again at the starting materials of the aspirin synthesis reaction, acetic acid and salicylic acid, each compound has one peak in the 1650 to 1850 cm-1 range on their IR spectra. Salicylic acid was a white, chalky powder; acetic anhydride a clear, colorless liquid; and phosphoric acid a clear, yellow-tinted liquid. The Synthesis of Aspirin 1. To begin the experiment, 2.00 g of salicylic acid (formula weight of 138.12 g/mol), 5.0 mL of acetic anhydride (density of 1.082 g/mL), and 5 drops of phosphoric acid were mixed in a 150mL Erlenmeyer flask, which was then placed in a beaker containing de-ionized (DI) water heated to 75°C on a hot plate. synthesize and analyze aspirin by the esterification of salicylic acid to aspirin using acetic anhydride. To finish the experiment, three titration trials were performed using the synthesized aspirin. Caution – acetic anhydride, salicylic acid, and phosphoric acid are all toxic chemicals and should not come into contact with the skin. Thus, the peak at 1679.70 cm-1 represents a carboxylic acid. The name aspirin was invented by the … First, based on the NMR spectra of the starting materials in the aspirin synthesis reactions, it is conclusive that there are no starting materials present in the final product, and that the peaks on the NMR spectrum of synthesized aspirin show the hydrogen atoms in CH3 and aromatic hydrocarbon in the final structure. 2 0 obj INTRODUCTION: Recall that last week you did the reaction shown to prepare aspirin… By matching the synthesized aspirin peak at 1749.46 cm-1 to the peak values in table 2.4, it is evident that this peak represents the ester in the structure of aspirin. First, an average molecular weight of 1.7 x 102 g/mol was derived from titrations (table 2.2). The trial results of the commercial aspirin titrations are listed below: As mentioned in the experimental section, the first trial was not used in the final calculation of the average NaOH concentration. The starting reading of NaOH was recorded. The spectrum attained from NMR spectroscopy of synthesized aspirin is below: Figure 2.1 The NMR spectrum of synthesized aspirin displays a peak 2.4 PPM and a range of peaks from 7 PPM to 8.3 PPM. The proposed laboratory is a hybrid of both classic (synthesis of aspirin, TLC analysis, 1 H, 13 C NMR and IR spectra) and new (molecular modeling) chemistry elements. We suggest a simple and safe method for the synthesis … The Beer-Lambert law and two (FT-IR) permits continuous monitoring of the spectral chemometric approaches, partial least squares (PLS) baseline and simultaneous analysis of different compo- and … Last week you made and purified aspirin. The two peaks in the 1650 to 1850 cm-1 range in the synthesized aspirin IR spectrum (figure 2.2) are at 1679.70 cm-1 and 1749.46 cm-1. This paper describes the first of our organic synthesis experiments, the synthesis, purification, and qualitative spec-troscopic characterization of aspirin. From these two analyses, it can be concluded that no reactants remain in the final product aspirin, and that the functional groups present in the synthesized aspirin NMR spectrum are CH3 and aromatic hydrocarbon (benzene). Because the synthesized aspirin spectrum does not have a peak at 9.1 PPM to represent alcohol or, as mentioned previously, at 10.3 PPM to represent carboxylic acid, the synthesized aspirin has no leftover salicylic acid present. The solution was then inserted into an Anasazi 60 MHz FT-Nuclear Magnetic Resonance Spectrometer and the spectrum was printed. After the vapor dissipated, a second volume of DI water, 20 mL, was added. Therefore, the second peak from acetic acid pertains to the hydrogen the carboxylic acid, at 11.0 PPM. The electronic spectra, percentage metal analysis … stream However, looking at the structure of synthesized aspirin, the remaining component that has not been identified but is present in the structure is carboxylic acid. This leaves a peak at 9.1 PPM and a range of peaks from 6.7 to 8.1 PPM. Aspirin is a drug that is usually used to relieve minor aches and pain and other medical uses such as anti-inflammatory medication. The trial results of the synthesized aspirin titrations are listed below: By combining all three molecular weights, the average molecular weight was 1.7 x 102 g/mol. 5.11.6 use volumetric analysis to determine the concentration of aspirin in solution (link with Section 5.3); 5.11.7 recall the synthesis of aspirin from salicylic acid using ethanoic anhydride and reasons for … In the following experiment, Aspirin was synthesized and analyzed in a laboratory setting in order to recognize the chemical process behind a common drug like aspirin and to relate it to the conceptual study of organic chemistry. Thus, the synthesized aspirin was close to the identity of commercial aspirin, but not exactly, so it can be concluded that the synthesized aspirin was not entirely pure. The experiment differs in three ways from traditional aspirin synthesis experiments for general chemistry. << /Length 4 0 R /Filter /FlateDecode >> Acetic acid has a peak at 1704.69 cm-1 and salicylic acid has a peak at 1652.36 cm-1. Synthesis of Aspirin Lab Report The goal of this experiment was to synthesize aspirin. It is designed to be performed early rather than late; it starts from a naturally occurring material and requires two steps rather than one; and it utilizes FTIR spectroscopy to distinguish among oil of wintergreen starting material, salicylic acid intermediate, and aspirin product. Acetic anhydride reacts with Salicylic acid to yield the ester (aspirin). After aspirin synthesis was complete, the aspirin was analyzed using both IR and NMR spectrometers in order to determine the hydrogen atoms and organic functional groups present in the synthesized aspirin and to verify the overall identity of the aspirin. A useful synthesis of acetylsalicylic acid was developed in 1893, patented in 1899, marketed under the trade name of “aspirin” by the Bayer Company in Germany. After 15 minutes of maintained heat, the flask was removed from the water and 2 mL of DI water was added, producing an aromatic vapor. xڽ}M��q�=E�f`+�?�@�#�5�DI/�����A��Y��׫��+�:=��`%3�naz��2#=<<����*�jB^���1Z�WWV|��n�������?��]��뷫�������+�����ߙ��.�w?Q��ê�P�����r>�l�qi��R�����c;��m��_~&N�`F��O��u|�Ϗݕ`��_y�_q��3��+a��x|ez���A(��A�Y^�^1OW�%O'�Ȯ��=73_����d����^O�z���W���a���w����nq�N��b����������Ǖ[�iE^���'���qm+lÜw��Gw���%��j��.8뎞��J��͇�Z�F���J,G�zqE����Jp���?�W�?Z�z%�p��劉q�>���w�k4����1�v�y��Ă3�է�[��[�X�����>��O���9���PP�P�8H'���!\¾��W�"���㜽. The proposed laboratory is a hybrid of both classic (synthesis of aspirin, TLC analysis, 1H, 13C NMR and IR spectra) and new (molecular modeling) chemistry elements. Aspirin (acetylsalicylic acid) is a pain-relieving compound familiar to virtually all students. These trials’ pink solution were light, while the first trial’s pink solution was too dark, and resulted in a smaller concentration of NaOH. NMR was the first to be tested: a glass NMR tube was filled with the aspirin sample to a height of approximately 0.5 cm and 0.6 mL of CDCl3 was added in order to avoid large protein peaks. Most students know about aspirin, a pain-relieving compound, and they gain knowledge about the role of chemistry in real-life applications from its synthesis. %PDF-1.3 The proposed laboratory is a hybrid of both classic (synthesis of aspirin, TLC analysis, 1H, 13C NMR and IR spectra) and new (molecular modeling) chemistry elements. Lastly, the crystals were scraped into a labeled, pre-weighed beaker and placed in a 40°C oven for 46 hours to dry. Qualitative analysis of the Pure Aspirin Synthesized The pure Aspirin prepared was characterized qualitatively by physical constants, ferric chloride test, esterification and IR spectroscopic studies. 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