1.

How will you prepare potash alum?

Answer»

The alunite the alum stone is the naturally occurring form and it is K2SO4 . Al2(SO4) .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. It is purified by recrystallisation.

K2SO4.Al2(SO4)3 .4Al(OH)3 + 6H2SO4 ⟶ K2SO4 + Al2(SO4)3 + 12H2O

K2SO4 + Al2(SO4)3 +24H2O  ⟶K2SO4.Al2(SO4)3.24H2O



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