Rainbow without sun. Fun chemistry experience at home

ENTERTAINING EXPERIENCES AT HOME
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Rainbow without sun. Chemical experiments

Entertaining experiments in chemistry

Entertaining experiences at home / Chemistry experiments for children

Optical methods are often used in chemical research. The phenomenon that you will now observe is used to determine the melting point of a substance.

Prepare about fifteen identical plates of thin glass (for example, old photographic plates are suitable). Rinse the emulsion from them with hot water and cut into squares about 5x5 cm in size. Put ten of these squares one on top of the other and wrap them with insulating tape from the ends so that the stack does not crumble. Sprinkle some sodium thiosulfate (hyposulfite) on one of the remaining plates and heat gently to melt the crystals. Heat another free plate and immediately cover the melt with it. A thin transparent layer of molten salt forms between the plates. If it turns cloudy, add a little, literally one or two drops of water. When the melt cools in air, hyposulfite will begin to crystallize; this in itself is curious to observe through a magnifying glass.

Place a sheet of black paper on the table, and clean thin glass on top of it. Turn on a bright lamp and sit at the table so that you can see the reflection of the lamp in the thin glass lying on the table through the stack you will be holding. By changing the slope of the stack, leaning closer to the table, or moving away from it, find a position at which the reflection of the lamp will fade. It is better to look at the stack from an acute angle. If direct light from a lamp bothers you, cover the stack with a screen or palm, but so that you can see the light reflected from the table.

With your free hand, take the hyposulfite plates and place them between the stack and the table so that they are in the path of the light. Slightly rotate and tilt them - and you will see a very beautiful rainbow.

An explanation of experience would lead us into the world of not chemical, but physical phenomena. We will only tell you how with the help of such stacks - they are called polarization - they measure the melting point. The rainbow that you observed only appears in crystals. If, however, a solid substance is gradually heated, then at the very moment when the substance passes into a liquid state, the rainbow will disappear.

Author: Olgin O.M.

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