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Zaara

  • one year ago

AlF3 is almost insoluble in anhydrous HF but dissolves if KF is present.passage of BF3 through the resulting solution causes AlF3 to precipitate... can anyone explain the idea behind this?

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  1. abb0t
    • one year ago
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    AlF3 doesn't dissolve in HF because of the fluorine. It's doesn't allow for coordination due to the hydrogen. However, it will dissolve in KF. If you look at the chemical reaction, it's able to form a salt! \[3 KF + AlF_3 -> 3 KF.AlF_3\] However, when BF3 is added \[3 KF.AlF_3 + 3 BF_3 -> AlF_3(s) + 3 KBF_4 \]

  2. Zaara
    • one year ago
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    can u pls explain ur first 2 statements.... i want a detailed answer...

  3. abb0t
    • one year ago
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    H-F is a pretty strong bond compared to K-F.

  4. Zaara
    • one year ago
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    yeah right! thankx

  5. abb0t
    • one year ago
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    Not much I can use to describe this w/o going outside the scope of general chemistry.

  6. Zaara
    • one year ago
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    ya pretty difficult...

  7. abb0t
    • one year ago
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    The best explanation is with a chemical reaction. In an inorganic chemistry course, the explanation I gave would be detailed enough. To be more specific, it's b/c the product formed with BF3 is more complex. able to decompose AlF3

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