AlF3 is insoluble in liquid HF but dissolves if NaF is present. When BF3 is added to the solution, AlF3 precipitates. Explain.

Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter21: Transition Metals And Coordination Chemistry
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AlF3 is insoluble in liquid HF but dissolves if NaF is present. When BF3 is added to the solution, AlF3 precipitates. Explain.

 

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Well, we have to consider the formation of complex to predict whether it will dissolve or precipitates out. We know ionic compounds dissociate completely to ions and hence they are capable of providing enough cation or anion.

Apart from this we have to know, BF3 has more tendency to form complex with fluoride ion than aluminum so it can replace aluminum easily in the aluminum fluorine complex. 

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