Do not attempt to repeat following experiment at home! Hello everyone. Today we will conduct a very interesting Christmassy experiment, called "Winter in the glass."
This experiment is about sublimation of benzoic acid. Benzoic acid is an organic compound that looks as a white powder.
For this experiment we will need a fir tree branch. And to begin, let’s pour a small amount of benzoic acid into a large glass.
Next, put the fir branch in the glass, so that the fumes of benzoic acid, which are going to form, can settle on this branch.
Now we take the spirit lamp, ignite it and put our glass on top of it until it warms up.
I’ve put the evaporating cup on top of the glass, so that benzoic acid fumes, which are formed in this reaction, won’t escape.
After some time the glass is heated to the level that the benzoic acid begins to sublimate. This is the change from solid to gaseous state without going through the liquid phase.
After some time, the glass is going to get filled with fumes of benzoic acid.
Sublimation occurs fairly quickly, and after a while we take the glass away from the heat to cool it down.
With the cooling of the glass, fumes of benzoic acid are condensed on the walls and on the fir branch.
We’ve now got a beautiful visualization of winter.
I'm trying to clean up the glass wall in order to see better what is inside. And there are beautiful crystals of benzoic acid that can be seen to form on the fir branch and around it. However, the crystals are quite fragile and if you shake the branch, they will easily fall off. This experiment is very beautiful and spectacular, and if you live where there is little or no snow, it may help you brighten its absence. Facebook: [ Ссылка ]
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