Someone help with this organic chemistry lab. I have one question, but for some information this is what we did: Dissolve $5$ g of Na$2$CO$3$ in $250$ mL of ion$-$exchanged water in a beaker.

$10$ tea bags are added

The solution is heated on a hot plate. When the solution boils, the hob is switched off, while

the beaker still stands on the plate.

Leave the mixture for $20$ minutes. Stir gently with a glass rod occasionally, to increase

the extraction of caffeine. The tea bags should preferably not be punctured, as this will do so

more difficult to filter the mixture.

Filter the hot mixture through a piece of gauze in a glass funnel into a

Erlenmeyer flask, but leave the tea bags in the beaker. Use a spatula and then press

as much liquid as possible out of the tea bags.

Cool the flask with the solution in cold water to room temperature.

The mixture is extracted with $3$ x $25$ mL of dichloromethane. Shake gently during extraction

to avoid the formation of an emulsion. If an emulsion is formed, this will

making separation of the water phase and organic phase difficult. The combined organic phases

washed with $20$ mL deionized water and dried with MgSO$4.$

The desiccant is filtered off, and the filtrate is collected in a tared $100$ ml round flask.

Dichloromethane is evaporated on a rotavapor. Determine weight of extracted caffeine.

Take a small sample for melting point measurement and thin layer chromatography.

Purification of caffeine by sublimation

Scrape out as much of the caffeine as possible from the round flask and weigh it$.$ Transfer this to that

outer tube on a "cold finger".

Mount the cold$-$finger and gas washing bottle as shown in fig. $2$ and put on water suction and

cooling water. Be careful to install the hoses correctly to avoid backlash.

Heat the cold finger using a heating mantle $($step $8)$ until all the caffeine has sublimed. Hit

off the heat and carefully loosen the hose to the water suction.

Scrape the caffeine from cold$-$finger onto a tared watch glass and weigh.

Measure the melting point of purified and unpurified caffeine. The question is can you draw schematically the procedure for isolating and purifying caffeine from tea, please show structures too. Will leave an upvote. 

Answer rating: 100% (QA)

Since I am an AI language model I am unable to draw schematics However I can provide you with a step... View the full answer