Lec-33-Chap16-2

Lec-33-Chap16-2 - Lewis Acids and Bases A more general...

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1 A more general acid-base definition: A Lewis acid Lewis acid accepts a pair of e - to form a bond. A Lewis base Lewis base donates a pair of e - to form a bond. A B .... + A B Acid e - pair acceptor Base e - pair donor Coordinate covalent bond Coordinate covalent bond : a shared e - pair, with both e - donated by the same atom. Lewis Acids and Bases A Lewis acid Lewis acid has an empty orbital. A Lewis base Lewis base has a lone pair of electrons. Lewis Acids and Bases
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2 Lewis acid Lewis base + H O H H H O H H Examples: Examples: + N H H H B F F F B F F F N H H H H + + H 2 OH 3 O + Lewis acid Lewis base Lewis Acids and Bases Metal ions can act as Lewis acids. They have: ± Missing e - ± Empty valence orbitals ± Metal atom + Lewis base complex ion Hydroxide ions are Lewis bases ± O is e - rich (has large electronegativity) ± Can easily donate an e - pair to a bond : δ + δ - - :O–H Ag + (aq) + 2 :NH 3 (aq) [H 3 N:Ag:NH 3 ] + (aq) Positive Metal Ions as Lewis Acids
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3 Many metal hydroxides are amphoteric amphoteric – they react with acids and bases.
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Lec-33-Chap16-2 - Lewis Acids and Bases A more general...

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