Question
Define acids and bases on the basis of Lewis concept. Give examples.
✓
Answer
Lewis concept of an acid and a base is based on the electronic theory.
Acid: It is defined as any species (molecule or ion) that can accept a pair of electrons. E.g. $BF _3$, $AlCl _3$ and all electron deficient species like cations $\left( K ^{+}, Ag ^{+}\right)$and molecules having incomplete octet, like $BeF _2, BF _3$.
Base : It is defined as any species (molecule or ion) that can donate a pair of electrons. E.g. $NH _3$, $C _2 H _5 NH _2$ and all electron rich species like anions $\left( Cl ^{-}, OH ^{-}\right)$and all molecules with lone pair of electrons.
Acid: It is defined as any species (molecule or ion) that can accept a pair of electrons. E.g. $BF _3$, $AlCl _3$ and all electron deficient species like cations $\left( K ^{+}, Ag ^{+}\right)$and molecules having incomplete octet, like $BeF _2, BF _3$.
Base : It is defined as any species (molecule or ion) that can donate a pair of electrons. E.g. $NH _3$, $C _2 H _5 NH _2$ and all electron rich species like anions $\left( Cl ^{-}, OH ^{-}\right)$and all molecules with lone pair of electrons.
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