Question

H3BO3(aq) + HS-(aq) H2BO3-(aq) + H2S(aq) What is the sequence of Brønsted-Lowry acids and bases?

Answer 1

Answer : The correct sequence is,

$\text{Acid}+\text{Base}\rightleftharpoons \text{Conjugate Base}+\text{Conjugate Acid}$

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.

The given equilibrium reaction will be,

$H_3BO_3(aq)+HS^-(aq)\rightleftharpoons H_2BO_3^-(aq)+H_2S(aq)$

In this reaction, $H_3BO_3$ is an acid that donate a proton or hydrogen to $HS^-$ base and it forms $H_2BO_3^-$ and $H_2S$ are conjugate base and acid respectively.

That means, $H_3BO_3$ and $HS^-$ are acid and base and $H_2BO_3^-$ and $H_2S$ are conjugate base and acid respectively.

The general sequence of Brønsted-Lowry acids and bases is:

$\text{Acid}+\text{Base}\rightleftharpoons \text{Conjugate Base}+\text{Conjugate Acid}$

Hence, the correct sequence is,

$\text{Acid}+\text{Base}\rightleftharpoons \text{Conjugate Base}+\text{Conjugate Acid}$

Answer 2

Acid + base base + acid