Lewis acids and bases can be described as hard or soft. Examples of Lewis Acids: H+, K+, Mg2+, Fe3+, BF3, CO2, SO3, RMgX, AlCl3, Br2. Examples of Lewis Bases: OH-, F-, H2O, ROH, NH3, SO42-, H-, CO, PR3, C6H6.Click to see full answer. Also to know is, what is Lewis base with example?A Lewis base, then, is any species that has a filled orbital containing an electron pair which is not involved in bonding but may form a dative bond with a Lewis acid to form a Lewis adduct. For example, NH3 is a Lewis base, because it can donate its lone pair of electrons.Furthermore, what is a good Lewis base? 1. Ammonia donating to an electron acceptor or Lewis acid. Lewis bases may be anionic or neutral. The basic requirement is that they have a pair of electrons to donate. Examples of Lewis bases include halide ions such as bromide or chloride. Then, what is meant by Lewis acid and Lewis base? In other words, a Lewis acid is an electron-pair acceptor. A Lewis base is any substance, such as the OH- ion, that can donate a pair of nonbonding electrons. In the Lewis theory, an acid is any ion or molecule that can accept a pair of nonbonding valence electrons.Is Na a Lewis acid or base?Na+ is quite happy the way it is, because it has an octet configuration (1s2, 2s2p6). However, it is also happy to accept some electron density from Lewis bases, so that it can relieve its burden of carrying around a single positive charge. Hence, Sodium cation (Na+) can act as a Lewis acid.