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what happens when BF3 is treated with NH3

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As BF3 is a Lewis acid and NH3 is a Lewis base, NH3 donates its lone pair to BH3 and forms a dipolar bond. NH3 gets a positive formal charge and BH3 gets a negative formal charge and adduct is formed.

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since BF3 is a Lewis acid and NH3 is a Lewis base, NH3 donates its lone pair to BH3 and forms a dipolar bond.

NH3 gets a positive formal charge and BH3 gets a negative formal charge. an "adduct" is formed.

File:NH3-BF3-adduct-bond-lengthening-2D.png

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thanks for your help

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