Spilling of product or solution is another source of error, along with other mistakes due to human error, as are dust or any other environmental conditions that could impair the results of the experiment. They are also known as painkillers, and act in various ways on the peripheral and central nervous systems. The colors of each test tube were recorded in a data table. Aspirin Recrystallization The crude product of acetylsalicylic acid crystals were placed in a 125 mL Erlenmeyer flask and diethyl ether, heated on a steam bath, was added drop-wise, while swirling, until all crystals had dissolved. Since aspirin has a hydrophobic aromatic ring, it did not dissolve in water. All of the physical characteristics of the different chemicals in Figure 3 are constants, as well. Our sample mass was 0.
The symptoms vary, but the bottom line is the same: Your computer doesn't work the way it used to. The sections of your lab report should include an abstract, introduction, results section, discussion, conclusion, and experimental sections. Heating was employed so that salicylic acid would melt and react with acetic anhydride. Since this esterification reaction is not spontaneous, sulfuric acid was used as a catalyst to initiate. The first of these that is used is the procedure of weighing by difference.
To verify the identity of the Aspirin, completely dissolve. However, there are possible sources of error in this experiment. There are a few possible sources of error in the experiment as it stands. Aspirin is synthesized from salicylic acid and acetic anhydride. The tool is powerful enough to find malicious items that are hidden on the computer.
Place the 25 mL Erlenmeyer flask containing the product and ethyl acetate directly on the hot plate at 50 degrees Celsius. Firstly, the amount of materials could be increased. This would reduce yield and shift equilibrium toward the reverse reaction. Research Question: What is the concentration of Aspirin in a normal tablet? The end product is pure dry aspirin. The time values for each reaction were averaged with the other class values and standard deviation was calculated. In the reaction the hydroxyl group on the benzene ring in salicylic acid reacted with acetic anhydride to form an ester functional group. An experimental melting point range of 134 — 136 ˚C or narrower would suggest that the recrystallization procedure was sufficiently effective.
The flask was heated for 5 minutes over a steam bath to hydrolyze excess acetic anhydride then rapidly cooled in an ice bath. There are many instruments that can be used to measure liquid amounts that differ in measuring capacity and accuracy, but the one used in this experiment is the graduated cylinder. In this experiment aspirin was synthesized from salicylic acid and acetic anhydride. After cooling in an ice bath which further facilitates recrystallization and purification , the mixture was then suction filtered. Yard 55 chem 3341-111 The Preparation of Aspirin The purpose of this experiment is to synthesize aspirin acetyl salicylic acid from salicylic acid and acetic anhydride. In this lab, for recrystallization, the solution was allowed to cool to room temperature very slowly, but was then plunged rapidly into ice water.
Experimental Observations: Table 1: Experimental Data Values obtained in the Experiment Observation Value of Observation Mass of P-Aminophenol 3. Chemical reactions, Limiting reagent, Reagent 1348 Words 4 Pages Lab Report Macrocyclic Synthesis Heme Analog I. This initial crystallization can be induced by scratching the side of the beaker: such scratching will dislodge tiny glass particles that can be used as templates to start the crystallization process. After the reaction was complete some unreacted acetic anhydride and salicylic acid was still be present in the solution as well as some sulfuric acid, aspirin, and acetic acid. By comparing the actual yield of the reaction and the theoretical yield, one can then find the yield percentage of the experiment.
Our theoretical yield was calculated to be 5. The percent yield of the purified aspirin product was 5. Anti-inflammatory, Aspirin, Laboratory glassware 1383 Words 6 Pages Lab Report Introduction This lab has the following two concepts: synthesis of acetylsalicylic acid and analysis of acetylsalicylic acid. After downloading, navigate to the file location and double-click it. On the other hand, water was added after heating not at the start of the experiment. This experiment also taught the importance of diligence and following directions carefully.
The theoretical yield was calculated to 3. Rinse the Aspirin in the filter crucible by putting 10 mL of chilled water in the aspirator, stirring it well, and then allowing the water to be quickly suctioned away. This information gave us a percent yield of 91. The active ingredient in aspirin was found to be salicylic. However, what if it's a virus causing the blue screen error? This requires that you research the exact error message that's listed on the Blue Screen.
We have learned from She Stoops to Conquer that, although. Acetic acid, Chemistry, Distillation 612 Words 3 Pages. Lower absorbance values would indicate that a greater concentration of phenol was present and the absorbance value could be used to directly determine the concentration 1 Cappelli, G. Crystallization can also be induced by adding some already-formed crystals from another solution. Reimage is the only program that has over 25,000,000 files in a repository and actually fixes your corrupted, malfunctioning and missing Windows software files.
Some test tubes developed into a gummy polymer of salicylic acid, likely because they were heated for too long. The first factor that caused a low percent yield was caused because we lost some crude product when we were moving our crude product from the weigh boat to the 25 mL Erlenmeyer flask. However, a great deal of time is also spent making sure that the data results are presented in a consistent, concise, objective, conclusive and critical manner, in the form of a laboratory report. Synthesis produced significantly high percent yields for aspirin, however, produced extremely low and impure percent yields for Tylenol. Pyridine also activates the electrophile by reacting with acetic anhydride to form the N-acyliminium ion, as seen in Figure 3.