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405310750 wrote:Can someone explain why boric acid is a Lewis acid and an electron pair acceptor? Also does this mean that the conjugate base of boric acid is not stable since boric acid is a weak acid?
A Lewis acid (by definition) is an electron pair acceptor. Boron is able to accept an electron pair because it only has three oxygens bound to it, meaning it has space for one more pair to complete its octet. Boric acid is a weak acid, meaning it has a strong conjugate base (H2BO3-). It is my understanding that the more stable a conjugate base is, the stronger the acid is. Therefore, the conjugate base of boric acid should be relatively unstable since boric acid is a weak acid.
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