Aluminium trifluoride is insoluble in anhydrous HF but dissolves when NaF is added. It precipitates out of the resulting solution when gaseous BF3(boron trifluoride) is bubbled through. Give reasons.

Asked by Pragya Singh | 1 year ago |  50

1 Answer

Solution :-

Hydrogen fluoride (HF) is a very strong intermolecular hydrogenbonding covalent molecule. Because of this, it does not contain ions and does not dissolve aluminium trifluoride. Aluminium trifluoride dissolves when sodium fluoride (NaF) is added to the mixture. Due to the availability of free Fluoride anion, this is the case. The reaction which defines this process is given below:

Boron trifluoride precipitates from the solution when it is added to it. This is due to the fact that boron has a greater inclination to form complexes than aluminium. So when Boron trifluoride is introduced, B replaces Al in the complex molecules as a result of BF3. The reaction for this is given below:

Answered by Abhisek | 1 year ago

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