Classify each species as either a Lewis acid or a Lewis base. a. Fe³⁺ b. BH₃ c. NH₃ d. F^-

Verified step by step guidance

1. Understand the definition of Lewis acids and bases: A Lewis acid is a species that can accept an electron pair, while a Lewis base is a species that can donate an electron pair.
2. Analyze Fe^{3+}: It is a metal cation with a positive charge, which means it can accept electron pairs, classifying it as a Lewis acid.
3. Examine BH_3: Boron in BH_3 has an incomplete octet and can accept an electron pair, making it a Lewis acid.
4. Consider NH_3: Ammonia has a lone pair of electrons on the nitrogen atom, which it can donate, classifying it as a Lewis base.
5. Evaluate F^-: The fluoride ion has extra electrons and can donate an electron pair, making it a Lewis base.