Potassium aluminum sulfate dodecahydrate

Many families have alum, which is also known as potassium aluminum sulfate dodecahydrate. It has a good disinfecting effect when placed in the toilet. It is chemically classified as a mixed complex salt of potassium sulfate and aluminum sulfate. It is a white crystal. Sometimes potassium aluminum sulfate dodecahydrate will also appear translucent. It will produce precipitation when dissolved in water. The following is a detailed introduction to the specific relevant information of potassium aluminum sulfate dodecahydrate.

The luster is glassy, ​​sometimes with a slight pearly luster on the cleavage surface, and the luster of the blocky ones is dull or slightly waxy. Transparent to translucent. The cleavage parallel to (0001) is not complete. The fractured crystals are shell-shaped; the massive ones are flaky, jagged, and sometimes earthy. Brittle in nature. It has a sour taste.

A complex salt of potassium sulfate and aluminum sulfate containing water of crystallization. At 20 degrees and 1 standard atmosphere, the solubility of alum in water is about 5.90g. It loses 9 molecules of crystal water at 64.5℃ and 12 molecules of crystal water at 200℃. It is slowly soluble in glycerol, soluble in water, and insoluble in ethanol and acetone.

Chemical composition: Alunite is alkaline potassium aluminum sulfate [KAl3(SO4)2(OH)6], which contains 11.4% potassium oxide (K2O), 37.0% aluminum oxide (Al2O3), 38.6% sulfur trioxide (SO3), and 13.0% water (H2O).