g resulting in a low percent yield of 12%. Extraction of Caffeine into water and then into ethyl acetate Place 120 mL of water in a 250 mL beaker and place it on … = =5% After subjecting the tea mixture to the entire process of extraction, decantation and evaporation, caffeine was successfully obtained. To isolate caffeine from tea by solid-liquid and liquid-liquid extraction . The computed percentage yield was 5%. This process leaves behind the water insoluble portions of the tea bag. In order to extract the caffeine from the tea leaves the solid-liquid extraction and liquid-liquid extraction were done first. Discussion: In order to isolate caffeine from tea, an extraction process was conducted that would allow one to obtain crude caffeine. Based on the physical and chemical properties of the components one could isolate caffeine from tea. Percentage by mass of caffeine in tea = formula x 100 = 0.12%. Discussion; According to the calculation, the percentage by mass of caffeine in tea was very small. 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. 2. 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. Report the mass of the crude extract and the total mass of dry tea leaves used in the extraction. 0.5 g of caffeine was collected from 10g of tea leaves. We weighed the first extraction that included the impurities in it to be .25 g and the final extraction without the impurities to be . the estimated value in tea leaves based on the assumption that 2% of the mass is caffeine. It is the process of obtaining mixture or compound through chemical, physical and mechanical means. Report the theoretical amount of caffeine in one bag of Lipton tea. 1. The first step is similar to brewing tea, in which it is simply being boiled to heat the components. Extraction is the technique we use to separate organic compounds from a mixture of compounds. 2. Results and Discussion. 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. However, water extracts more than just caffeine, so a final separation is done with an organic solvent that will dissolve primarily caffeine. Test the purity of your extracted caffeine using TLC. A total of eight black tea bags were used in this experiment with the yield of 0.041g of impure caffeine. To purify the product by sublimation . ...Extraction of Caffeine from Tea Leaves Introduction Caffeine is soluble in boiling water and as a result it is easily extracted from tea bags by steeping in hot water. 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. 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 Academia.edu is a platform for academics to share research papers. This might be due to some errors during the experimental procedure. 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