Classify each of the following as a Lewis acid or ...

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Classify each of the following as a Lewis acid or a Lewis base.BeCl2, NH3, O2-, SO3, Fe2+

Jules Bruno · Accepted Answer

Recall that a Lewis acid is the one accepting an electron pair while a Lewis base is the one donatingFor BeCl2, if we will analyze its Lewis structure, Be will have 2 valence e- while Cl will have 7 electrons, total of 16. Be will appear to be single bonded to both Cl atoms.[readmore]This Be atom is capable of accepting an electron since it only has 2 electrons around it. Therefore BeCl2 is a Lewis AcidFor NH3, N has 5 v.e. while H has 1, total v.e is 8 (5 + (1*3) = 8). Hs will be single bonded to N with 1 lone pairPresence of a lone pair is on a molecule tells that it's a good Lewis baseTherefore  NH3 is a Lewis BaseFor O2-, this molecule has a negative charge in its structure so we don't have to draw the structure to find a lone pair.  Most of the time negatively charged molecules are always a Lewis BaseTherefore O2- is a Lewis BaseFor SO3, v.e. of S is 6 while O is 6, total v.e. is 24 (6 + (6*3) = 24)Structure will appear as S being the central atom (less electronegative than O) while double bonded to all the O atoms. O atoms have 2 lone pairs on itS will appear here as electropositive because it donated all the electrons for bonding making the atom less electronegative which will attract an electronSO3 will be considered as Lewis acidFor Fe2+, this will appear to be accepting an electron since it's positively chargedMost of the time, positively charged species are always considered as a Lewis acidTherefore Fe2+ is a Lewis acid

Problem: Classify each of the following as a Lewis acid or a Lewis base.BeCl2, NH3, O2-, SO3, Fe2+

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Problem: Classify each of the following as a Lewis acid or a Lewis base.BeCl2, NH3, O2-, SO3, Fe2+

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