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Starting from boric acid how can you pre...

Starting from boric acid how can you prepare boron trifluoride.

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Boric acid, on heating with `CaF_2` and cone. `H_2 SO_4` forms boron trifluoride.
`CaF_2+ H_2SO_4 to CaSO_4 + H_2F_2`
`2H_3 BO_3 + 3H_2F_3 to 2BF_3 + 6H_2O`
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