First slide

Uses of Boron & Aluminium

Question

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

Moderate

A

a white precipitate
B

bluish white precipitate
C

a clear solution
D

a crystalline mass

Solution

$Potash alum is K_{2} {SO}_{4} . {Al}_{2} {({SO}_{4})}_{3} . 24 H_{2} O {Al}_{2} {({SO}_{4})}_{3} + 6 NaOH \to 2 Al {(OH)}_{3} ↓ (white) + 3 {Na}_{2} {SO}_{4}; Al {(OH)}_{3} + {OH}^{-} \to {[Al {(OH)}_{4}]}^{-} (soluble complex)$

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