Red solution

An interesting red solution from the blue powder can be obtained as follows. Take the powder from the cup, demonstrate its blue color and fill it in a dry glass. Then pour half a glass of water, stir the powder with a glass rod and get a red solution.

An interesting red solution from the blue powder can be obtained as follows

To make a blue powder, fry in a cup of crimson crystals of chloride cobalt CoCl2*6H2O.

Crystalline hydrate decomposes, releasing crystallization water, and turns into an amorphous powder of cobalt chloride CoCl2 of light blue color.

Crystallization water evaporates from the crystals and anhydrous cobalt chloride, colored in blue, remains. When anhydrous cobalt chloride dissolves in water, a red solution is obtained - six molecules of water are attached to the cobalt chloride molecule.

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