Artificial algae. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Artificial algae. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Fill six test tubes almost to the top with a fifty percent solution of sodium silicate (liquid glass). Then, in the first of them, throw a few crystals of ferric chloride, in the second - copper chloride, in the third - cobalt chloride, in the fourth - nickel chloride, in the fifth - manganese chloride, in the sixth - aluminum chloride. After a while, the growth of "algae" of a bizarre shape and various colors begins. In a solution of iron salts, "algae" are brown, cobalt salts are blue, aluminum salts are colorless, etc. Why does this happen?

The crystals thrown into the liquid glass solution react with sodium silicate. The resulting compounds cover the crystals with a thin film, but due to diffusion, water penetrates through it, the pressure in the crystals rises and the film bursts.

Through the holes, the salt solution penetrates into the surrounding liquid and quickly becomes covered with a film again. Then the film breaks again. This is how branching "algae" grow.

Author: Shkurko D.I.

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