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Topic: AlF3 is soluble in liquid HF?  (Read 8152 times)

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Offline hsebast1

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AlF3 is soluble in liquid HF?
« on: November 02, 2009, 10:05:11 PM »
AlF3 is soluble in liquid HF, but dissolves if NaF is present. When BF3 is added tot he solution,AlF3 precipitates.
 Can u plz explain y. i do have a sense of wat is goin on...

Offline csrscience.com

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Re: AlF3 is soluble in liquid HF?
« Reply #1 on: November 02, 2009, 10:07:46 PM »
What you are saying doesn't make much sense.. It is soluble in HF but dissolves if NaF is present?
... it seems like they are almost contradicting each other the way you worded it...

My guess for what it is you are asking is that the reason why AlF3 is more soluble in NaF than in HF is because the Na+ and the F- fully dissociate, while HF is a weak acid and does not?
or vice versa.. not sure haha
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Offline AWK

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Re: AlF3 is soluble in liquid HF?
« Reply #2 on: November 03, 2009, 01:44:33 AM »
Soluble H3AlF6 and Na3AlF6 are formed.
BF3 decomposes this complex compoumd forming stronger complex HBF4 or NaBF4, hence AlF3 precipitates.
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