Chapter 18, Problem 18.22P

Interpretation Introduction

Interpretation:

One acid - base reaction using conjugate acid-base pair with $\text{Kc > 1}$ and $\text{Kc < 1}$ for the given ${\text{HS}}^{\text{-}}{\text{, Cl}}^{\text{-}}{\text{, HCl, H}}_{\text{2}}\text{S}$ has to be written

Concept introduction:

Conjugate acid-Base pairs:

The acid donates the proton to form its conjugate base and the base accepts a proton to form its conjugate acid.

When an acid is dissolved in water, the acid $\text{(HA)}$ donates a proton to water to form a new acid (conjugate acid) and a new base (conjugate base).

The pair of an Acid –Base differs by a proton called conjugated Acid-Base pair.

In acid – base reaction, if the stronger acid produces the weaker acid which tells that the reaction favors the products, and the $\text{Kc}$ value is greater than one $\left(\text{Kc > 1}\right)$. If the weaker acid produces the stronger acid which tells that the reaction favors the reactants, and the $\text{Kc}$ value is less than one $\left(\text{Kc < 1}\right)$.