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Anwer: the first option, a hydrogen ion acceptor.

The acid-base model of Bronsted-Lowry is focused on hydrogen ion. An acid is a donor of hydrogen ions and a base is a receptor of hydrogen ions.

\(\boxed{{\text{A hydrogen ion accept or}}}\) describes a Bronsted-Lowry base.

Further Explanation:

Different theories have definitions of acids and bases. These theories are as follows:


1. Arrhenius theory: According to this theory, acid produces hydrogen or hydronium ions in a solution, while the base produces hydroxide ions in a solution. HCl, \({\text{HN}}{{\text{O}}_3}\) and  \({{\text{H}}_2}{\text{S}}{{\text{O}}_4}\) are Arrhenius acids while NaOH and KOH are the examples of Arrhenius bases.


2. Bronsted-Lowry theory: This theory defines acid as the proton or hydrogen ion donor and base as the proton or hydrogen ion acceptor. \({{\text{H}}_2}{\text{O}}\) acts as Bronsted acid while \({\text{N}}{{\text{H}}_3}\) is a Bronsted base.


3. Lewis theory: According to this theory, an acid accepts a pair of electrons from electron-rich species while a base donates electrons to electron-deficient species in the reaction. Examples of Lewis acids are \({\text{B}}{{\text{F}}_3}\), \({\text{S}}{{\text{O}}_3}\) while \({{\text{H}}_2}{\text{O}}\) and ROH are the examples of Lewis base.


A hydrogen ion acceptor

According to Bronsted-Lowry theory, Bronsted-Lowry base is the species that accepts protons or hydrogen ions. So this is incorrect.


An electron pair donor

A compound that donates an electron pair act as Lewis base, not Bronsted-Lowry base. So this is incorrect.


An electron pair acceptor

A compound that accepts an electron pair act as Lewis acid, not Bronsted-Lowry base. So this is incorrect.


A hydrogen ion donor

According to Bronsted-Lowry theory, the species that donates protons or hydrogen ions is known as Bronsted-Lowry acid, not base. So this is incorrect

Learn more:

1. The reason for the acidity of water https://brainly.com/question/1550328

2. Reason for the acidic and basic nature of amino acid. https://brainly.com/question/5050077


Answer details:

Grade: High School

Subject: Chemistry

Chapter: Acid, base and salts


Keywords: acid, base, electrons, protons, Arrhenius theory, Lewis theory, Bronsted-Lowry theory, hydrogen, hydronium ion, hydroxide ion, accept, donate, hydrogen ion acceptor, hydrogen ion donor, electron pair donor, electron pair acceptor.