How is base strength related to the availabihty of the electron-pair?

Base strength depends on the ability of the basic site (which always has an unshared electron pair) to accept a proton. This ability depends on the charge in an anion or electron density in a molecular base. For species with an identical charge, dispersal or delocalization of the electrons from the basic site to other parts of the molecule results in decreased electron density and decreased base strength.

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