Extraction Of Caffeine From Tea Lab Report

Since caffeine is more soluble in dichloromethane 140 mg ml than it is in water 22 mg ml it readily dissolves in the dichloromethane.

Extraction of caffeine from tea lab report.

Procedure add about 10 0 g of tea leaves to around 100 ml of water in a 400 ml beaker cut open the tea. From the solution caffeine was extracted using 60 ml dichloromethane. This is essentially the same procedure used to decaffeinate drinks such as coffee and tea. A 50 ml beaker along with 2 boiling stones was weighed in advance with a total mass of 27 56 g during the extraction process.

The mixture was then decanted to collect the residue. Once settled the solution separated into 2 layers. Elizabeth pingnovember 22 20111 isolation of caffeine from tea introduction. Stopper the separatory funnel.

Caffeine was extracted from tea by the use of solid liquid and liquid liquid extractions. Hold the stopper into the neck of the funnel tightly and gently shake it. Then turn the stopcock away from body and open the stopcock to release. The purpose of this experiment was to isolate caffeine that is found in tea by.

Put 15 ml of dichloromethane in the separatory funnel with coffee and tea solution. Because caffeine is water soluble and is a base sodium carbonate must be added to the. Anhydrous calcium chloride pellets were used to dry the solution and emulsion layer and the dcm was then decanted. The hot solution is allowed to cool and the caffeine is then extracted from the water with dichloromethane methylene chloride which is an organic solvent that is insoluble in water.

A pure product of 065 g caffeine was obtained. The solvents used in the experiment were an aqueous sodium carbonate and dichloromethane dcm. 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. Due to the reaction pressure built up inside the funnel requiring the stopcock to be opened to release excess gas following each inversion.

The product that was collected after extraction still had many impurities. Caffeine was extracted from dried tea leaves using single extraction technique. Caffeine can be extracted easily from tea bags. Then to prove that the extraction is mainly caffeine we can carry out two tests.

Set a separatory funnel 2. To extract caffeine the heated tea solution along with 5 ml of methylene chloride was poured into an isolated separatory funnel and inverted to mix the solution completely. Caffeine lab 1 isolation of caffeine from tea in this experiment caffeine will be extracted from tea leaves where it is about 5 present using hot water. The procedure was simply steeping the tea with very hot water for a few minutes which aided in extracting most of the caffeine.

Sodium carbonate and hot water were added to the tea bags and was let to stand for about 7 minutes in order to bring the caffeine molecules out of the tea bags and into the aqueous solution. 10 grams of leaves was boiled in a solution of anhydrous sodium carbonate and 100 ml distilled water. In this experiment a solid liquid extraction method was used first to extract the caffeine room the tea leaves tea bags to by dissolving sodium carbonate in hot water and creating an aqueous sodium carbonate solvent. Interesting reminds me of a similar experiment at university where we extracted caffeine from.

Put 15 ml of coffee and tea solution in a separatory funnel 3. After washing the anhydrous calcium chloride pellets with more dcm the solvent was evaporated leaving. An acid base liquid liquid extraction took place in order to force caffeine into the organic layer. The leaves of the tea plant the kola nut whose extract is used to.