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Oxidation Number Method

AI F 3 is ins...

Question

$A I F_{3}$ is insoluble in a hydrous $H F$ but when little $K F$ is added to the compound it becomes soluble. On addition of ${B F}_{3}$ , $A I F_{3}$ is precipitated. Write the balanced chemical equations.

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Solution

$A l F_{3}$ becomes soluble due to the formation of $[A l F_{6}]^{3 -}$ an addiction of KF
$[A l F_{6}]^{3} + 3 B F_{3} \to 3 [B F_{4}]^{-} + A l F_{3} ↓$
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