The computed percentage yield was 5%. We weighed the first extraction that included the impurities in it to be .25 g and the final extraction without the impurities to be . Extraction is the technique we use to separate organic compounds from a mixture of compounds. Report the theoretical amount of caffeine in one bag of Lipton tea. Objectives: 1. In this experiment, caffeine was isolated from tealeaves through extraction, distillation and sublimation. To isolate caffeine from tea by solid-liquid and liquid-liquid extraction . To purify the product by sublimation . Data and Results Caffeine Extraction Worksheet Tea extract # Description Data 1 Volume of Extract (mL) Amount of caffeine in Extract (mg/mL) HPLC Sample 1 2 Total Caffeine in 100 mL sample 3 Tare weight of rb flask 4 Final weight of flask + dried caffeine 5 Crude caffeine isolated (mg) (4)-(3) 6 Yield of Crude Caffeine (%) (5)/(2)*100 = =5% After subjecting the tea mixture to the entire process of extraction, decantation and evaporation, caffeine was successfully obtained. It is the process of obtaining mixture or compound through chemical, physical and mechanical means. Introduction: The components of tea leave include protein, polysaccharide, pigments and amino acids (3-5%), caffeine (2-3.5%), polyphenols (catechin and tannin), carbohydrate, gallic acid, ash and small amount of saponins. 2. In order to extract the caffeine from the tea leaves the solid-liquid extraction and liquid-liquid extraction were done first. Report the mass of the crude extract and the total mass of dry tea leaves used in the extraction. 2. 4). Results and Discussion. Discussion; According to the calculation, the percentage by mass of caffeine in tea was very small. This might be due to some errors during the experimental procedure. 1. Academia.edu is a platform for academics to share research papers. Discussion: In order to isolate caffeine from tea, an extraction process was conducted that would allow one to obtain crude caffeine. 0.5 g of caffeine was collected from 10g of tea leaves. This process leaves behind the water insoluble portions of the tea bag. The first step is similar to brewing tea, in which it is simply being boiled to heat the components. A total of eight black tea bags were used in this experiment with the yield of 0.041g of impure caffeine. However, water extracts more than just caffeine, so a final separation is done with an organic solvent that will dissolve primarily caffeine. EXTRACTION OF CAFFEINE FROM TEA Joey Tran/ Lab Partners: Michael Smith & Nicholas No CHM245N-048N 10/8/2017 Abstract/Purpose: In this lab, the purpose was to extract caffeine from tea. Calculate the percent recovery of the crude extraction of caffeine from dry tea leaves (eq. the estimated value in tea leaves based on the assumption that 2% of the mass is caffeine. Percentage by mass of caffeine in tea = formula x 100 = 0.12%. DISCUSSION. Caffeine (also known as Guaranine, Methyltheobromine, and Thein) is defined as a naturally occurring chemical stimulant of the central nervous system that occurs in beans, leaves, fruit, and beverages such as tea, coffee and soda. Discussion We were successful in extracting caffeine from the tea bags, but based on the percent yield, we were not successful in extracting a large amount of caffeine. g resulting in a low percent yield of 12%. Test the purity of your extracted caffeine using TLC. 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