Question

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

Answer 1

acid + base base + acid

Answer 2

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}`