Preparation of Aluminium Sulphate from Kaolin

Preparation of Aluminium Sulphate from Kaolin. Roast about 25 g of kaolin with the access of air in a muffle furnace (800 °C) to remove the moisture and oxidize 

Treat the product with hot water, filter the solution, and evaporate it until crystals form. Let the cooled solution stand for crystallization. Pour a drop of the hot saturated solution onto a slide, examine the formed crystals under a microscope, and draw their shape. 

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