AlF3 is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble.

Question 1

AlF3 is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble. On addition of BF3, AlF3 is precipitated. Write the balanced chemical equations.

Question 2

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 [AIF6]3- by pulling out F- from it and forming BF-4.

kratos · Answer 1 · 2020-09-15T05:27:36+0000

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 [AIF6]3- by pulling out F- from it and forming BF-4.

AlF3 is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble.

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AlF3 is insoluble in anhydrous HF but when little KF is added to the compound it becomes soluble.

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