Acids & Bases
What You’ll Learn
A Lewis acid is a chemical species that can accept an electron pair from a Lewis base to form a coordinate covalent bond. A Lewis base is a chemical species that can donate an electron pair to a Lewis acid. Common examples of Lewis acids include boron trifluoride (BF3), aluminum trichloride (AlCl3), and the ferric ion (Fe3+). Common examples of Lewis bases include ammonia (NH3), water (H2O), and halide ions like chloride (Cl-).