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How will you prepare potash alum? |
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Answer» Solution :The alunite the alum STONE is the naturally OCCURING form and it is `K_(2)SO_(4).Al_(2)(SO_(4))_(3).4Al(OH)_(3)` When alum stone is treated with excess of sulphuric acid, the aluminium hydroxide is converted to aluminium sulphate. A calculated quality of potassium sulphate is added and the solution is crystallised to generate potash alum. ITIS purified by recrystallisation. `K_(2)SO_(4).Al_(2)(SO_(4))_(3).4Al(OH)_(3)+6H_(2)SO_(4)toK_(2)SO_(4)+Al_(2)(So_(4))_(3)+12H_(2)O` `K_(2)SO_(4)+Al_(2)(SO_(4))_(3)+24H_(2)OtoK_(2)SO_(4).Al_(2)(SO_(4))_(3).24H_(2)O` |
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