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The preferred method of preparing NH4BF4 is the reaction of boric acid with ammonium hydrogen difluoride,...

The preferred method of preparing NH4BF4 is the reaction of boric acid with ammonium hydrogen difluoride, NH4(HF2). Please explain why this may be so.

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Answer #1

Ammonium bifluoride or ammonium hydrogen difluoride, NH4(HF2) is thermally unstable and decomposes to release HF. In solutions NH4(HF2) contain tetrahedral [NH4]+ cations and linear [HF2]− anions. Ammonium tetrafluoroborate is frequently used for the preparation of boron trifluoride.


2NH4HF2 + H3BO3 --> NH4BF4 + 3H2O ↑ (g) + NH3↑ (g)
Since when two substances (NH4HF2 + H3BO3) react with the liberation of steam and ammonia. Only pure Ammonium tetrafluoroborate (NH4BF4) remains in the product as other by products are escapes in gaseous form.

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