NCERT Class XI Chemistry The p-Block Elements Solutions

Question : 16

Total: 38

Aluminium trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF. Aluminium trifluoride precipitates out of the resulting solution when gaseous BF3 is bubbled through. Give reasons.

Solution:

AlF3 is insoluble in anhydrous HF but when little NaF is added the compound becomes soluble. On adding BF3 to the above solution, AlF3 is reprecipitated along with sodium tetrafluoroborate.

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