1. How pure is your sample? When analysing our sample under UV light we could see if our sample was pure. We labelled the sample with 1= which was our sample, 2= the pure aspirin sample, 3= the salicylic acid. As you can see from my sample that our aspirin sample contains a small amount of pure aspirin and a lot of salicylic acid. Therefore this means that my sample wasn’t pure as it still had remnants of salicylic acid which suggests to me that the reaction hadn’t been fully completed, however my sample did contain a small amount of pure aspirin which means that the reaction is partially had taken place. The sample would have been pure if there was no salicylic acid on the card then my sample would match the pure aspirin sample which means there would have been a fully completed reaction. 2. State what practical techniques used during the procedure and explain how they influence the purity of the sample. …show more content…
This means that the reaction acted quicker and would increase the probability of the sample being pure, this would mean that you didn’t have to wait very long and the material changes that have taken place whilst the reaction was taken place would be easier to define and make a note of the start and end point. The precipitation reaction forms aspirin crystals which involves joining ions in solutions to form a precipitate. Another technique that we used was filtration. The equipment we used was a Buckner which uses gravity and a vacuum and this gets rid of the moisture in the sample and creates a dry sample. Another technique would be dissolving and reacting which involves the crystals to be made and for the chemicals to react to make the
Next, about 10 mL of both solutions, Red 40 and Blue 1, were added to a small beaker. The concentration of the stock solution were recorded, 52.1 ppm for Red 40 and 16.6 ppm for Blue 1. Then, using the volumetric pipette, 5 mL of each solution was transferred into a 10 mL volumetric flask, labelled either R1 or B1. Deionized water was added into the flask using a pipette until the solution level reached a line which indicated 10 mL. A cap for the flask was inserted and the flask was invented a few times to completely mix the solution. Then, the volumetric pipette was rinsed with fresh deionized water and
The purpose of this experiment was to isolate the three components of Excedrin using column chromatography. Thin layer chromatography (TLC) was used to determine when each of the components had been fully eluted from the column. If there was an overlap in fractions between two components, liquid- liquid extraction was done to separate them. The compounds were characterized via NMR instrumentation and the percent recovery for each compound was calculated to determine whether the isolation was
Specific to the experiment, the distillation technique will be used to separate the two miscible liquids, conclude their identities based on the boiling points
Precipitate is solid material that forms when chemical reactions happen. Reagents are basically compounds that react. Temperature, color, fume, and precipitate changes are possible changes noticeable in chemical reactions. Conductivity Testing Multimeters test direct current, or DC voltage, which is a galvanic current. It measures electric charge like a battery.
Molecular analysis is a well-known method and recently used by researchers. Using this
Modifications of this procedure include the use of hot plates instead of Bunsen burners, and heating t-butyl alcohol to 60-65 ℃ instead of 50 ℃. Other modifications include the use of weighing boats to measure an amount of unknown instead of weighing paper, and completing one run of unknown 2 instead of two runs of unknown 2. Summary of
Pages 96-98 in Chemistry 110 Lab Manual. Wilfrid Laurier University, ON, Canada. Abstract: The purpose of this experiment was to determine the level of purity by using the values for melting point and absorbance and chemically synthesizing aspirin by using phosphoric acid as a catalyst.
If there is a color change, then it is known that protein is present in the solution. Finally, lipids are tested. 5 mL of water are added to 5 mL of oil. 5 drops of Sudan 3 are added, and if the color changes, then lipids are present. Next, the McMush is tested.
Unknown A is Excedrin because they both look like white powders and they were both soluble. When the universal indicator was added they both turned red, which indicted their pH level was 4.0. Then when we tested the pH with the pH strips they both showed the pH as being 3.0. After that, we added HCl or stomach acid and both drugs dissolved and were soluble. We tested the pH and it dropped to 1.0.
The addition signs for each test on serum 2216 illiterates how concentrated the molecule is like purple for example was the most concentrated due to the amount of addition signs in the table. For Macromolecule test 1 and 2 the sample was diluted. Both the concentration and decreased by an equal set of intervals. The volume of distilled water is what was added and the results illustrate how deeply colored each concentration was. Each cup was diluted with the test pertaining to it with a syringe that explain the volume and the concentration is from heating or mixing the sample throughout the investigation.
Aspirin is considered a “polydrug” due to its variety of uses stretching from pain-relief to disease prevention. Salicylic acid is derived from the bark and leaves of the willow tree. Salicylic acid belongs to a group of phytochemicals which have been shown to have positive effects on human health. Salicylic acid is a phenolic compound that can be found in a variety of plants and is a crystal organic carboxylic acid. However, it is more commonly viewed as the primary metabolite and active compound of acetyl salicylic acid, which has been used as an anti-inflammatory drug by physicians for over 100 years.
Qualitative identification of unknown: There were three indicators used which contained four different tubes of acid going from the weakest to the strongest. The indicators included: thymol blue, malachite green, and crystal violet. The unknown solution was poured into three test tubes where each indicator was used. The unknown acid solution colour was then compared to the display of the acid solutions. Quantitative analysis:
The reagents used were Diphenylamine reagent which contains concentrated H2SO4. The standard solution used for this test is the deoxyribose standard solution. In the sample, only a faint blue solution appeared, which indicates a small presence of deoxyribose. In test for Phosphate, the standard solution was the Phosphate solution and the reagents used were concentrated H2SO4, concentrated HNO3, 2.5% ammonium molybdate solution.
Also, although this likely served no contribution in disheveling the results, using a stirrer of the same material to ensure the separate testing of each substance will be as uniform as
The limit of quantification (LOQ) and limit of detection (LOD) were determined based on the slope and the standard deviation of the response using the signal-to-noise ratio (S/N) as per ICH Guidelines Q2(R1) 2005. The LODs for Lamivudine, Abacavir and Dolutegravir were found to be 0.021, 0.330 and 0.038µg/mL respectively, and the LOQs for Lamivudine, Abacavir and Dolutegravir were 0.056, 1.320 and 0.095 µg/mL respectively. (table 6 ) Robustness Robustness of the method was performed by making slight deliberate changes in the analytical methodology like flow rate and solvent ratio. It was observed that this method did not significantly affect in system suitability parameters like USP tailing factor, theoretical plates and resolution, which confirmed that the developed HPLC method is