Potash Aluminium Sulphate is an inorganic compound. It is the double sulphate of aluminium and potassium with molecular formula KAl(SO4)2. It is often experienced as dodecahydrate. In an alkali/base solution, Potassium Aluminium Sulphate crystallizes as a cubic structure, but when it comes into contact with the neutral solution, its crystallization is like an octahedral structure. It has other names, or maybe synonyms, like Potash-Alum, burnt-potassium-alum, and Aluminium Potassium disulfate. Alum of potassium and aluminium is the most significant member of the generic class, which plays a vital role in chemical compounds. Alum of potassium and aluminium with sulphate in a ratio 1:1:2 is metal sulphate. It is commonly referred to as “Fitkari”.
Potash Alum is highly soluble in water but nonsoluble in ethanol and acetone. On heating, it turns a red color and forms a porous, thus-called burnt alum.
It is large, hard, stable, and transparent crystalline fragments or powder.
Appearance | Crystalline powder |
Boiling point | 200°C |
Density | 1.725g/cm |
Melting point | 92°C |
Chemical formula | KAl(SO4)2 |
Molar mass | 474.37 g/mole |
pH | Between 3,0 and 4,0
(10% solution) |
Potassium Alum is widely used in various fields of daily life, including:
Industrially, today, Potassium Alum is produced by adding Aluminium sulphate in potassium sulphate solutions (concentrated form).
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