Respuesta :
Answer : The correct option is, (a) [tex]NH_4^+[/tex]
Explanation :
According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.
Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.
(a) The equilibrium reaction will be,
[tex]NH_4^++H_2O\rightleftharpoons NH_3+H_3O^+[/tex]
In this reaction, [tex]NH_4^+[/tex] is an acid that donate a proton or hydrogen to [tex]H_2O[/tex] base and it forms [tex]NH_3[/tex] and [tex]H_3O^+[/tex] are conjugate base and acid respectively.
Thus, [tex]NH_4^+[/tex] is act as Brønsted-Lowry acid.
(b) The equilibrium reaction will be,
[tex]NH_2^-+H_3O^+\rightleftharpoons NH_3+H_2O[/tex]
In this reaction, [tex]H_3O^+[/tex] is an acid that donate a proton or hydrogen to [tex]NH_2^-[/tex] base and it forms [tex]NH_3[/tex] and [tex]H_2O[/tex] are conjugate acid and base respectively.
Thus, [tex]NH_2^-[/tex] is act as Brønsted-Lowry base.
(c) The equilibrium reaction will be,
[tex]CN^-+H_3O^+\rightleftharpoons HCN+H_2O[/tex]
In this reaction, [tex]H_3O^+[/tex] is an acid that donate a proton or hydrogen to [tex]CN^-[/tex] base and it forms [tex]HCN[/tex] and [tex]H_2O[/tex] are conjugate acid and base respectively.
Thus, [tex]CN^-[/tex] is act as Brønsted-Lowry base.
(d) The equilibrium reaction will be,
[tex]F^-+H_3O^+\rightleftharpoons HF+H_2O[/tex]
In this reaction, [tex]H_3O^+[/tex] is an acid that donate a proton or hydrogen to [tex]F^-[/tex] base and it forms [tex]HF[/tex] and [tex]H_2O[/tex] are conjugate acid and base respectively.
Thus, [tex]F^-[/tex] is act as Brønsted-Lowry base.
(c) The equilibrium reaction will be,
[tex]CH_3COO^-+H_3O^+\rightleftharpoons CH_3COOH+H_2O[/tex]
In this reaction, [tex]H_3O^+[/tex] is an acid that donate a proton or hydrogen to [tex]CH_3COO^-[/tex] base and it forms [tex]CH_3COOH[/tex] and [tex]H_2O[/tex] are conjugate acid and base respectively.
Thus, [tex]CH_3COO^-[/tex] is act as Brønsted-Lowry base.
From this we conclude that that, [tex]NH_4^+[/tex] species could not react as a Brønsted-Lowry base.
Hence, the correct option is, (a) [tex]NH_4^+[/tex]
NH4+ is the species of ion that cannot react as a Brønsted-Lowry base.
What is Bronsted Lowry acid and base?
Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction while a Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.
This definition means that for a substance to qualify as a Brønsted-Lowry acid, it must have protons or hydrogen ions to donate.
According to this question, NH4+ cannot react as a Brønsted-Lowry base because it can only donate and not accept protons.
Learn more about Bronsted Lowry acid at: https://brainly.com/question/14922754
