p-Block elementsHard

Question

When a solution of sodium hydroxide is added in excess to the solution of potash alum, we obtain :

Options

A.a white precipitate
B.bluish white precipitate
C.a clear solution
D.a crystalline mass

Solution

Potash alum is K2SO4.Al2(SO4)3.24H2O and so,
Al2(SO4)3 + 6NaOH →  2Al(OH)3 ↓ (white) + 3Na2SO4 ; Al(OH)3 + OH- →  [Al(OH)4]- (soluble complex)

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