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Reference.org
Boron trifluoride
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<p>Boron trifluoride is the <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> BF3. This pungent, colourless, and <a href="/facts/Toxic/qa96rs60">toxic</a> gas forms white fumes in moist air. It is a useful <a href="/facts/Lewis_acid/qlLqRvg2">Lewis acid</a> and a versatile building block for other <a href="/facts/Boron/Pmwgd7Mf">boron</a> compounds. </p>