Extraction of caffeine from tea lab report conclusion. Caffeine Lab Report 2023-01-06
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In the extraction of caffeine from tea lab, the goal was to isolate and purify caffeine from tea leaves using a series of chemical techniques. The first step in the process was to create an aqueous extract of the tea leaves by soaking them in hot water. This extract was then filtered to remove any solid particles, and the resulting liquid was treated with an acid to lower the pH and make the caffeine more soluble.
Next, the caffeine was extracted from the aqueous solution using diethyl ether, a non-polar solvent that is not miscible with water. The ether extract was then washed with aqueous sodium bicarbonate solution to remove any impurities, and the resulting solution was dried over anhydrous magnesium sulfate to remove any remaining water.
Finally, the purified caffeine was recovered by evaporating the ether solvent, leaving behind a white, crystalline solid. The purity of the caffeine was then determined using thin layer chromatography, which showed that the caffeine had been successfully isolated and purified to a high degree of purity.
In conclusion, the extraction of caffeine from tea lab was successful in isolating and purifying caffeine from tea leaves using a series of chemical techniques. The purified caffeine was of high purity, as determined by thin layer chromatography. This lab demonstrates the usefulness of chemical techniques in the isolation and purification of specific compounds, and highlights the importance of proper technique and handling of chemicals in the laboratory.
Extraction of caffeine from tea lab typemoon.org
For maximum effect, I distill nail polish remover 5. A liquid-liquid extraction was then performed to extract the caffeine from the mixture by adding dichloromethane. We did not repeat the process. The mass of an empty 100 cm3 round bottom flask and magnetic stirrer was measured and the data value was recorded in the data table. This common yet nutritive beverage contains different kinds of substances that can be categorized into two major groups: water moisture 75-78% in fresh fleches and dry matter 22-25% in fresh fleches.
Lab Report: Extraction of Caffeine from Tea Bags Free Sample
It was then distilled, and then the remaining dichloromethane was evaporated, leaving crude, greenish-white crystalline caffeine. Synthetic caffeine is made by a chemical synthesis of urea as the raw material and can also be exposed to a number of harsh chemicals including: methylene chloride, ethyl acetate and carbon dioxide. Theoretical Background Extraction is a method used for the separation of organic compound from a mixture of compound. Inorganic matters constitute 3. The extract is the solution where caffeine dissolved in, and it is obtained in the separation funnel. In conducting this experiment, we only add 75 cm3 of dichloromethane CH2Cl2 into the funnel, however maybe more of dichloromethane CH2Cl2 should be added into the funnel to ensure all caffeine were extracted.
Extraction Of Caffeine From Tea Waste And Its Benefits: Free Essay Example, 1262 words
Experimental Procedure The first step was to weigh out 9 to 10 grams of tea. In the case of this experiment, the organic compound caffeine will be focused on. The clear solution obtained from the separation funnel was poured into the empty, 100 cm3 round bottom flask that has already had a magnetic stirrer. Lab Report: Extraction of Caffeine from Tea Bags The purpose of this experiment was to perform a liquid-liquid extraction method to extract the caffeine from the tea bags that were provided, and then recrystallize the caffeine. We added some additional hexane to help transfer and wash the crystals through the vacuum filtration. The required caffeine in the tea leaves is partially dissolved in the solvent and then extracted from the tea leaves into the solvent. Details of the procedure are on pg 8-11 in the Pharmaceutical section of the 3rd year laboratory manual.
In this experiment caffeine C8H10N4O2 , a white, slightly bitter, odorless, crystalline solid was extracted from tea, using the process of boiling, extraction, separation, drying and evaporation techniques. We rocked the separatory funnel several times and then extracted the dichloromethane from the funnel into a beaker, excluding the emulsion layer that had formed. Anhydrous calcium chloride pellets were used to dry the solution and emulsion layer and the DCM was then decanted. During the experiment, a tea bag was heated in boiling water for about 15 minutes. The melting point of the purified caffeine was found to be 237-239 °C.
The presence of these other compounds finally may lead to the impurity of the caffeine after it has been extracted from the tea sample which may cause alteration in the method used in extracting the tea sample, which will be shown later in the report. Distillation unit was set according to the figure as shown below 15. Tea itself is a beverage that is commonly consumed by many people since 2,000 years ago in China, and infusing the young leaves basically produces it and leaf buds of the tea plant, Camelia Sinesis in the boiling water. Some of the sample was collected by scraping a capillary tube against the edge of the test tube. By following the basis of different densities of dichloromethane CH2Cl2 and water caffeine mixture can be separated by draining out the dichloromethane CH2Cl2 solvent through the funnel and therefore extracted from the tea sample. A wood stick served as a boiling stick to prevent superheating.
This organic compound is responsible for the astringency, colour, and some of the flavour in tea. Lab 4-5: Extraction of Caffeine from Tea; Sublimation of Caffeine Elizabeth Bellizio Tyler Hamby Lisa Nguyen October 3, 2012 Introduction In this experiment, caffeine was extracted from tea leaves then purified using sublimation. It is okay to draw some tea along with the dichloromethane solution. The mass of the tea bag was measured in a digital balance, and the value that was obtained was recorded in the data table as follows Mass g Empty 100 cm3 round bottom flask + magnetic stirrer 100 cm3 round bottom flask + caffeine + magnetic stirrer Tea bag 2. After washing the anhydrous calcium chloride pellets with more DCM, the solvent was evaporated, leaving greenish-white crystalline caffeine residue weighing about. The cool tea extract was transferred into a separation funnel and 25 cm3 Dichloromethane CH2Cl2 was added carefully into the solution by tilting the separation funnel.
The Extraction of Caffeine from Tea—with Several Important Outcomes
Reagent grade Magnesium Oxide. In a liquid-liquid extraction, two layers are needed- an organic layer and an aqueous layer- that are both immiscible in water. Because caffeine and methylene chloride are non-polar, they are also generally immiscible in water Hill, T5-1. Distillation unit was set according to the figure as shown below 15. Residual water is separated from dichloromethane by drain out the dichloromethane through separating funnel, thus dichloromethane passed through the funnel while polar solvents such as water is still remains in the funnel. However only 30-50% of all substances is water-soluble extractive and passes into tea infusion.
So this data is clearly faulty. Theoretical yield average ïƒ 0. Instead, the tea leaves are mainly consist of cellulose, pigments, chlorophylls, and tannins. Water is separated from the recovered solvent in a solvent-water separator after which the solvent is recycled back into the extractor. The 100 cm3 round bottom flask containing the solution was put into the distillation unit until the Dichloromethane CH2Cl2 solvent was gone leaving the caffeine in the form of solid precipitate behind. Tea also contains caffeine.
Lab Report: Extraction of Caffeine from Tea Bags Free Essay Example 1163 words
Good day, Gentle Readers: After a recent study of Intermolecular Forces, my AP Chemistry students experienced the joy of performing a microscale extraction of caffeine from tea. Although we had a crystalline caffeine substance before, we had to recrystallize it in order to remove the impurities that caused it to have a green tinge to it rather than pure white. The tea bag was also placed inside the 100 cm4 glass beaker and then was heated while being stirred with a glass rod, on a hot plate with a temperature of 290 0C for 20 minutes 6. As a result ann optimum result was not obtained after the distillation process. Caffeine is a somewhat non-polar compound with significant solubility in hot water and in dichloromethane, CH 2Cl 2 aka methylene chloride. Secondly the 2 g of the Sodium carbonate Na2CO3 was also added in this boiling process, because if the boiled or brewed tea is directly inserted to the separation funnel with the add of the solvent, dichloromethane CH2Cl2 other organic compounds such as tannins will also be extracted therefore by acting like a base that convert organic compounds such as tannins into their sodium salts so during the extraction process using the separation funnel they will be substances which are not soluble in solvents in the aqueous layer during extraction and will only be soluble in the water.
Professor Griffiths from John Hopkins said, "We need to recognize that caffeine really is a drug and accord it respect as a drug. Two grams of Na 2 CO 3 were added to the heating water. Pure caffeine was obtained in the sublimation. Because caffeine is water-soluble and is a base, sodium carbonate must be added to the hot water to prevent it from reacting with the acids present and to ensure it remains a base. Caffeine leaches the calcium from the bones, which leaves the bones very fragile. It also accounts for the production of natural caffeine which is a much safer and healthier option when compared to synthetically produced caffeine.
