I know it acts as a Lewis-base but I have no idea why. Could someone please explain this to me?
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It is one of the strongest reducing agents known (gives up electrons, thus making it a lewis base), probably because the valence electrons of the potassium within its lattice are so easily stripped, probably because they are weakly pulled on in several directions by the carbon that surrounds them.
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base. it reacts with weak protic acids such as water in an acid/base reaction.
thus acts as a base.
thus acts as a base.