Caffeine from tea

What substance in tea raises vitality and invigorates? It's about caffeine (this substance was first found in coffee beans). How can I get caffeine from tea at home?

It's about caffeine (this substance was first found in coffee beans). How can I get caffeine from tea at home?

Strictly speaking, there are several tonic substances in tea - vitamins, essential oils, etc. But the leading role belongs to caffeine, from the class of alkaloids (this is a vast class of nitrogen-containing organic compounds, including, for example, nicotine from tobacco).

To get caffeine from tea, you will need a porcelain or metal crucible (you can use any suitable metal vessel, like a glass). In it, put chopped black tea - about a teaspoon - and about 2 g of magnesium oxide. Mix both substances and place the crucible on the fire. Heating should be moderate, not too energetic. On top of the crucible or glass, place a porcelain cup or other similar vessel, for example a jam outlet, and pour cold water into it. In the presence of magnesium oxide, caffeine will sublimate, that is, turn into steam, bypassing the liquid stage. Getting on a cold surface, caffeine will return to the solid state and settle on the bottom of the cup or rosette in the form of colorless crystals. Stop heating, carefully remove the cup from the crucible and scrape the crystals into a clean bottle.

And how to make sure that you really have caffeine? For this there is a beautiful qualitative reaction. Place a few crystals on a porcelain or ceramic plate (the shard from the tile will fit) and drip one or two drops of concentrated (to handle extremely carefully!) Nitric acid. Heat the plate until the mixture on it is dry. Caffeine in this case will oxidize and turn into a noticeable, orange color, amalic acid.

But that's not all. Let's try to neutralize the acid, adding to it drops of ten concentrated ammonia solution (not pharmacy, but one that is sold in hardware stores). At neutralization the salt of a very beautiful, red, turning into a purple, color is formed. This salt is called murexide, and the reaction is murexide.

Tools