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Potassium tetrafluoroborate

Chemical compound From Wikipedia, the free encyclopedia

Potassium tetrafluoroborate
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Potassium tetrafluoroborate is an inorganic compound with the formula KBF4. It is a white, odorless crystalline powder, and crystallizes into orthorhombic space group Pbnm.[1]

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Potassium tetrafluoroborate has been reacted with molten lithium chloride, sodium chloride, and potassium chloride.[2] Lithium ions cause the decomposition of tetrafluoroborate leading to the production of BCl3 gas. The other liquid alkali chlorides do not decompose the tetrafluoroborate, even though they are at higher temperatures.[2]

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Preparation

Potassium fluoroborate is obtained by treating potassium carbonate with boric acid and hydrofluoric acid.

B(OH)3 + 4 HF → HBF4 + 3 H2O
2 HBF4 + K2CO3 → 2 KBF4 + H2CO3

References

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