First slide

Uses of Boron & Aluminium

Question

${AlF}_{3}$ is soluble in HF only in presence of KF. It is due to the formation of

Moderate

A

$K_{3} [{AlF}_{3} H_{3}]$
B

$K_{3} [{AlF}_{6}]$
C

${AlH}_{3}$
D

$K [{AlF}_{3} H]$

Solution

${AlF}_{3}$ is insoluble in anhydrous HF because the $F^{-}$ ions are not available in hydrogen bonded HF but, it becomes soluble in presence of little amount of KF due to formation of complex, $K_{3} [{AlF}_{6}]$
${AlF}_{3} + 3 KF ⟶ K_{3} [{AlF}_{6}]$

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