Question

Potash alum contains ____________ number of water molecules.
A. 24
B. 22
C. 20
D. 25

Answer 1

Hint: Potash alum is a chemical compound generally utilized as the potassium sulfate dodecahydrate. It is twofold salt that is utilized normally in medication and the water treatment measure. Potash alum is otherwise called potassium alum or potassium aluminum sulfate. The chemical formula of potash alum is\[{{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}.2{{H}_{2}}O\]. It is likewise generally alluded to as 'fitkari.'

Complete step by step solution: Potash Alum\[({{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}.2{{H}_{2}}O)\] is a colorless, odourless and translucent substance. Its crystals are set up by prepared concentrated solutions of potassium sulfate and aluminum sulfate. It is solvent in water. It contains 24 molecules of water.
Minerals, for example, alum schist, bauxite and cryolite treated with sulfuric acid are frequently used to get aluminum sulfate. The condensed solution containing equimolar amounts of potassium sulfate and aluminum sulfate is generally shaped by crystallization. The translucent solid that is shaped is acidic and colorless.
\[A{{l}_{2}}\left( S{{O}_{4}} \right)\left( aq \right)+{{K}_{2}}S{{O}_{4}}\left( aq \right)\to {{K}_{2}}S{{O}_{4}}.A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}.2{{H}_{2}}O\]
A limited quantity of dilute sulfuric acid is utilized to break down aluminum sulfate in warm water to prevent the hydrolysis of the salt. In the preparation of potash alum, when a two-salt solution is permitted to some degree, a twofold layer is framed. The word alum is given a special succession of twin salts. Then, "Neutral aluminum" is acquired by adding sodium carbonate to an aluminum solution.

Hence, the correct option is A. 24

Note: The structure or structure of potassium alum crystals is octahedral. It is practically colorless solid and is profoundly solvent in water. Gets a red color when heated in a specific way and structures a permeable, cold weight called 'burnt alum'. At the point when it is presented to extremely high temperatures hot particles of water vanish and sulfuric corrosive is delivered giving up a combination of alumina and potash sulfate.