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Reaction Quotient

Which equilib...

Question

Which equilibrium can be described as Lewis acid-base reaction but not Bronsted acid-base reaction?

A

H_{2} O + C H_{3} C O O H ⇌ H_{3} O^{+} + C H_{3} C O O^{-}

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B

2 N H_{3} + H_{2} S O_{4} ⇌ 2 N H_{4}^{+} + S O_{4}^{2 -}

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C

N H_{3} + H C l ⇌ N H_{4}^{+} + C l^{-}

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D

[C u (H_{2} O)_{4}]^{2 +} + 4 N H_{3} ⇌ [C u (N H_{3})_{4}]^{2 +} + 4 H_{2} O

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Solution

The correct option is D $[C u (H_{2} O)_{4}]^{2 +} + 4 N H_{3} ⇌ [C u (N H_{3})_{4}]^{2 +} + 4 H_{2} O$
Reactions (a), (b) and (c) involve a proton transfer and hence they are Bronsted acid – base reactions. Reaction (d) has no proton transfer but the electron pairs of ammonia is transferred to copper ion and hence it is a Lewis acid-base reaction.

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Similar questions

Q. Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition but bot using the Bronsted-Lowry definition

Q. From the following reactions identify each of an Arrhenius acid or base, Bronsted-Lowry acid or base, or Lewis acid or base.
(A)

N a O H

N a O H \to {N a}^{+} + {O H}^{-}

H C l

H C l \to H^{+} + {C l}^{-}

N H_{3}

N H_{3} + H^{+} \to N H_{4}^{+}

N H_{4}^{+}

N H_{4}^{+} \to N H_{3} + H^{+}

{(C H_{3})}_{3} N :

{(C H_{3})}_{3} N : + B F_{3} \to {(C H_{3})}_{3} N : B F_{3}

Q. Classify the following as acid or base according to Bronsted-Lowry concept.
(i)

C H_{3} C O O^{-}

H_{3} O^{+}

S O_{4}^{2 -}

Q. (a) Mention conjugate base of each of the following:

H S^{-}, H_{3} O^{+}, H_{2} {P O}_{4}^{-}, H {S O}_{4}^{-}, H F, {C H}_{3} C O O H, C_{6} H_{5} O H, H C l O_{4}, {N H}_{4}^{+}

(b) Mention the conjugate acid of each of the following:

{O H}^{-}, {C H}_{3} C O O^{-}, {C l}^{-}, {C O}_{3}^{2 -}, H_{2} {P O}_{4}^{-}, {C H}_{3} {N H}_{2}, {C H}_{3} C O O H, {N H}_{2}^{-}

(c) Which of the following behave both as Bronsted acids as well as Bronsted bases?

H_{2} O, H {C O}_{3}^{-}, H_{2} {S O}_{4}, H_{3} {P O}_{4}, H S^{-}, {N H}_{3}

(d) Which is stronger acid in each of the following pairs?

H C l, H I; H_{2} {C O}_{3}, H_{2} {S O}_{4}; H_{2} O, H_{2} S; C_{2} H_{5} O H, C_{6} H_{5} O H

(e) Which is stronger base in each of the following pairs?

{O H}^{-}, {C l}^{-}; {O H}^{-}, {N H}_{2}^{-}; {O H}^{-}, {C H}_{3} C O O^{-}; {C H}_{3} C O O^{-}, {C l}^{-}; {N H}_{3}, {C H}_{3} {N H}_{2}

(f) Classify the following into acids and bases according to Lewis concept:

S^{2 -}, H^{+}, {O H}^{-}, B F_{3}, {N i}^{2 +}, N F_{3}, A l {C l}_{3}, S n {C l}_{4}, {N H}_{3}, {({C H}_{3})}_{2} O

Q. Identify the correct statement(s) for the given reaction.

H C l + H_{2} O \to H_{3} O^{+} + C l^{-}

a) Conjugate base of

H C l

C l^{-}

b) Conjugate acid-base pair is

H_{3} O^{+}

H_{2} O

c) Conjugate base of

H_{2} O

H_{3} O^{+}

d) Conjugate acid-base pair is

H C l

H_{3} O^{+}

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