Chapter 3, Problem 3.13P

Interpretation Introduction

(a)

Interpretation:

The value of $\text{p}{K}_{\text{a}}$ for an acid that has ${10}^{-3}$ dissociation constant is to be predicted.

Concept introduction:

Dissociation constant $K_{\text{a}}$ is used to measure the strength of a Brønsted acid. There is an inverse relationship between the acidity of a Brønsted acid and its $\text{p}{K}_{\text{a}}$ value. Higher the value of $\text{p}{K}_{\text{a}}$, weaker is the acid.

The formula used to calculate the value of $\text{p}{K}_{\text{a}}$ is shown below.

$\text{p}{K}_{\text{a}}=-\log K_{\text{a}}$

Interpretation Introduction

(b)

Interpretation:

The value of $\text{p}{K}_{\text{a}}$ for an acid that has $5.8\times {10}^{-6}$ dissociation constant is to be predicted.

Concept introduction:

Dissociation constant $K_{\text{a}}$ is used to measure the strength of a Brønsted acid. There is an inverse relationship between the acidity of a Brønsted acid and its $\text{p}{K}_{\text{a}}$ value. Higher the value of $\text{p}{K}_{\text{a}}$, weaker is the acid.

The formula used to calculate the value of $\text{p}{K}_{\text{a}}$ is shown below.

$\text{p}{K}_{\text{a}}=-\log K_{\text{a}}$

Interpretation Introduction

(c)

Interpretation:

The value of $\text{p}{K}_{\text{a}}$ for an acid that has $50$ dissociation constant is to be predicted.

Concept introduction:

Dissociation constant $K_{\text{a}}$ is used to measure the strength of a Brønsted acid. There is an inverse relationship between the acidity of a Brønsted acid and its $\text{p}{K}_{\text{a}}$ value. Higher the value of $\text{p}{K}_{\text{a}}$, weaker is the acid.

The formula used to calculate the value of $\text{p}{K}_{\text{a}}$ is shown below.

$\text{p}{K}_{\text{a}}=-\log K_{\text{a}}$