Most of all, children like practical works - the cultivation of artificial crystals. This year, the club members worked with solutions of copper sulfate (sulphate), Chromium potassium alum (galloons) and red blood salt (potassium hexacyanoferrate (III), a complex compound K3[Fe(CN)6].
Children worked exclusively under the supervision of a supervisor with strict adherence to chemical handling instructions.
As a result, the crystalline forms of extremely bright blue copper sulfate crystals, red blood salts, saturated purple and chromokalium alum have grown in the correct form. Chromokalium alum - double salt, potassium sulfate and trivalent chromium. Formula: KCr(SO4)2 · 12H2O. Since this is a crystalline hydrate containing a significant amount of crystallization water, the crystal dehydrates and loses its color. To prevent the destruction of the crystals, the students placed them in jars with tightly closed lids to block the flow of air. Thus, the crystals were preserved and added to the school geological collection!
