Subjective Type

$$ AlF_{3} $$ is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble.On addition of $$ BF_{3} $$ $$ AlF_{3} $$ is precipitated. Write the balanced chemical equations.

Solution

AlF3 is soluble in HF in the presence of KF due to the formation of [AlF6]3- which is not formed in less dissociated anhydrous HF (stabilised due to intermolecular H bonding). The reaction looks like

3KF + AlF3 → K3[AlF6]

On adding BF3 (being more acidic than AlF3), it breaks[AlF6]3- by pulling out F- from it and forming BF4

K3(AlF6) + BF3 → AlF3↓ + 3KBF4

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