According to an American Chemist Lewis, acid is that substance which can accept a lone pair of electrons. e.g. AICb, BF3
AICl3 acts as acid as Al is short of two electrons to complete its valence shell
AICl3 + Cl AICI4
Acid Base (Complex ion)
According to him, a base is a species, which can donate a pair of electrons. e.g. OH”, F, NH3
The bond between NH3 and AICl3 is a coordinate covalent bond.
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