Caffeine extraction lab report. Lab Report: Extraction of Caffeine from Tea Bags Free Essay Example 1163 words 2022-10-06

Caffeine extraction lab report Rating: 9,6/10 806 reviews

Holes is a young adult novel written by Louis Sachar and published in 1998. It tells the story of Stanley Yelnats, a teenage boy who is falsely accused of stealing and sentenced to serve time at Camp Green Lake, a juvenile detention center in Texas. At the camp, Stanley and the other boys are required to dig a hole five feet wide and five feet deep every day as punishment and rehabilitation.

As Stanley begins his sentence, he quickly realizes that Camp Green Lake is unlike any other detention center he has ever heard of. The camp is located in a dry, desolate area with no lake, no trees, and no shade. The boys are given only one pair of shoes, one pair of socks, and one set of clothes, and they are not allowed to speak to each other or ask questions. The warden, Mr. Sir, and the counselor, Mr. Pendanski, are both cruel and abusive, and the boys are constantly hungry and thirsty.

Despite these difficult conditions, Stanley is determined to survive his sentence and return home to his family. As he digs his daily hole, he begins to uncover clues about the history of Camp Green Lake and the reason why the boys are required to dig. He learns that the camp was once a thriving community with a beautiful lake, but that the lake dried up and the town died when a group of criminals stole a valuable object from a wealthy man named Sam the Onion Man.

As Stanley and the other boys continue to dig, they uncover more and more clues about the past, including old coins, bones, and even a stolen bicycle. They also discover that the warden and Mr. Sir are searching for something specific, and that they will stop at nothing to find it.

As Stanley and his fellow prisoners work to solve the mystery of Camp Green Lake, they also learn about friendship, perseverance, and the importance of standing up for what is right. They come to understand that, despite the hardships they face, they have the strength and determination to overcome any challenge.

In the end, Stanley and his friends are able to solve the mystery and bring the perpetrators of the crime to justice. They also discover that the warden has been using the boys to dig for the valuable object, and they use this information to blackmail her into releasing them from the camp.

Holes is a beautifully written, poignant, and thought-provoking novel that deals with themes of justice, friendship, and the human spirit. It is a heartwarming and uplifting story that will leave readers feeling inspired and hopeful.

(PDF) Chem143 Lab 3 Extraction and Recrystallization of Caffeine

caffeine extraction lab report

This text provides students with a comprehensive organic chemistry laboratory experience that emphasizes Green Chemistry principles. To further perform the separation of caffeine Chloroform will be added to separate the inorganic and organic compounds leaving a final caffeine product to be dried. . The remaining organic layer that included the caffeine was dried using anhydrous calcium chloride pellets since they distilled, and then the remaining dichloromethane was evaporated, leaving crude, greenish-white crystalline caffeine. A liquid-liquid extraction was then performed to extract the caffeine from the mixture by adding dichloromethane. 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. Abstract 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.

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Lab Report: Extraction of Caffeine from Tea Bags Free Essay Example 1163 words

caffeine extraction lab report

This indicates that there were not enough amount of sodium carbonate Na2CO3 that was added during the boiling process which causes the solution to be not basic enough therefore not all tannins were converted into its salt form which makes them to be still soluble in the solvent, dichloromethane CH2Cl2 and thereby extracted when the organic layer bottom layer present in the separation funnel that supposed to be contained of the solvent and caffeine, also contained the tannin. The mass of the NaHCO3 had changed after the reaction occurred along with after it was placed on the hot plate and being in the drying oven. For example, at 0% concentration of caffeine the average heart rate of the Daphnia was 165 bets per minute however you can clearly see a difference in heart rate with the Daphnia when placed in a 0. The method that is used to separate an organic compound from a mixture of various kind of compound is called extraction. As a result ann optimum result was not obtained after the distillation process. The remaining organic layer that included the caffeine was dried using anhydrous calcium chloride pellets since they are neutral and unreactive and would not disrupt any further reactions.

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Extraction of caffeine lab report (1).pdf

caffeine extraction lab report

We added several spoon fulls until the anhydrous calcium chloride pellets stopped clumping together. In the case of this experiment, the organic compound caffeine will be focused on. The tea is placed into the sept funnel and washed with dichloromethane. Round Bottom Flask + Solid 56. Tannin, also called Tannic Acid, is any of a group of pale-yellow to light-brown amorphous substances in the form of powder, flakes, or a spongy mass, widely distributed in plants and used chiefly in tanning leather, dyeing fabric, making ink, and in various medical applications.

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Lab Report: Extraction of Caffeine from Tea Bags

caffeine extraction lab report

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. But since some residual water still present with the caffeine sample, the caffeine sample obtained after the distillation process has finished was further placed in the oven to remove those residual water therefore allowing us to obtained the caffeine sample, in this case of this experiment 0. The separation funnel was gently shaken up and down counted as 1 shake for 5 times. This crust-like precipitate contains the caffeine the targeted product , however it is seen in the figure below that the caffeine that should be white in color has a greenish color which indicates a presence of another organic substance, namely called tannin. The solution was decanted into a separate Erlenmeyer flask after it soaked for about 8 minutes. One reason is because when the test tube was pulled out of the flask, it was very difficult to make sure none of the sublimed caffeine was brushed off of the surface of the test tube. Once there was a distinct aqueous and organic layer present, the organic layer with dichloromethane was funneled out, dried with anhydrous sodium sulfate and then placed in the rotary evaporator Rotovap.

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Lab report 2

caffeine extraction lab report

Suction filtration was then performed using a Buchner funnel and a 125 mL filter flask. This process is done three times to purify the dichloromethane layer. The dichloromethane solution was then filtered into a clean Erlenmeyer flask using filter paper and a Hirsch funnel. After it was all mixed together, the mixture was boiled for 15 minutes, and then cooled down to 55 degrees C. The most common method for purifying solid compounds is from recrystallization.

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CHEMISTRY LAB childhealthpolicy.vumc.org

caffeine extraction lab report

Define and explain partition coefficient. An increase of 103 beats per minute on Acid Base Neutralization Lab Report 1001 Words 5 Pages Upon cooling, it was shaken until no bubbles were formed. Methods To begin the extraction process, the coffee bag was first weighed and the mass was. Unknown Compounds 469 Words 2 Pages More specifically, this lab was met in terms of gaining an understanding in separating an acid, base and neutral compound from a mixture and identify through melting point. This process was done by boiling the tea bag with water along with 2g of Sodium carbonate Na2CO3. The extracted caffeine was collected in this flask, and the flask was weighed again while it contained the caffeine. This was done in two separate extractions.

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Caffeine Extraction Lab childhealthpolicy.vumc.org

caffeine extraction lab report

A pure amount of 0. An additional 50 mL of hot water was added to the Erlenmeyer flask with the remaining tea bags and was then immediately decanted and added to the first extracted solution. The separation funnel was held horizontally with two hands, the stopper was held tightly with one hand by inverting the funnel and the cap of the separation funnel was also held tightly using another hand to make sure there was no liquid that would spilled. We were also able to remove the impurities by adding the dichloromethane to the aqueous solution in a separatory funnel, which created two different colored layers, a clear organic layer, which included the caffeine, and a brown aqueous layer that contained the impurities. Also, to become familiarize with the method of sublimation to extract the pure caffeine from the crude caffeine.

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Extraction Of Caffeine From Tea

caffeine extraction lab report

Filter the mixture using the vacuum apparatus The apparatus filtered slower than expected. Caffeine is a natural organic substance that is found inside the tea and it will be extracted by following the mechanism as follow: The first step of the mechanism was solid-liquid extraction in which insoluble material material inside the tea that is insoluble in water or non-polar components are separated from the soluble material or polar components. We extracted some more dichloromethane into the same beaker, but included the emulsion layer and added anhydrous calcium chloride pellets to dry the solution and emulsion layer. Firstly, the boiling process dissolved the caffeine in the tealeaves into the water so it would be separated from other insoluble substances such as cellulose, the primary leaf component. The pure caffeine was placed in the small filter flask.

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Caffeine Lab Report

caffeine extraction lab report

Because caffeine and methylene chloride are non-polar, they are also generally immiscible in water Hill, T5-1. The Rf calculations of aspirin in table 1 shows an Rf value of. This is also a valuable approach since there is minimal loss of material. Using a separatory funnel extract three times with 15. This method is completed through solid liquid extraction. 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.

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Caffeine lab report

caffeine extraction lab report

But since some residual water still present with the caffeine sample, the caffeine sample obtained after the distillation process has finished was further placed in the oven to remove those residual water therefore allowing us to obtained the caffeine sample, in this case of this experiment 0. The 10th time was repeated if there were some gas bubbles containing CO2 that can be seen. To accomplish this the tannins that give coffee its dark color must be removed in order to isolate the caffeine. We added hexane to the left over residue and then dissolved the greenish-white caffeine residue in 5 mL of hot acetone the solution was a cloudy white. The anhydrous calcium chloride was then washed with dichloromethane and then placed on a hot plate to evaporate it.

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