Chapter 14, Problem 103CWP

(a)

Interpretation Introduction

Interpretation: To justify if the given statements are true or false.

Concept introduction: The buffer solution is a solution contains weak acid and conjugate base or weak base and conjugated acid. It resists the change in $\text{pH}$.

To determine: The authenticity of the given statement, “A solution consisting of $0.10\text{M}{\text{CH}}_{\text{3}}{\text{NH}}_{\text{3}}\text{Cl}$ and $0.10\text{M}{\text{CH}}_{\text{3}}{\text{NH}}_{\text{2}}$ would have a higher buffering capacity than one containing $1.0\text{M}{\text{CH}}_{\text{3}}{\text{NH}}_{\text{3}}\text{Cl}$ and $1.0\text{M}{\text{CH}}_{\text{3}}{\text{NH}}_{\text{2}}$”.

(b)

Interpretation Introduction

Interpretation: To justify if the given statements are true or false.

Concept introduction: The buffer solution is a solution contains weak acid and conjugate base or weak base and conjugated acid. It resists the change in $\text{pH}$.

To determine: The authenticity of the given statement, “If $\left[{\text{CH}}_{\text{3}}{\text{NH}}_{\text{2}}\right]>\left[{\text{CH}}_{\text{3}}{\text{NH}}_3^{+}\right]$, then the $\text{pH}$ is larger than the $\text{p}{K}_{\text{a}}$ value”.

(c)

Interpretation Introduction

Interpretation: To justify if the given statements are true or false.

Concept introduction: The buffer solution is a solution contains weak acid and conjugate base or weak base and conjugated acid. It resists the change in pH.

To determine: The authenticity of the given statement, “Adding more $\left[{\text{CH}}_{\text{3}}{\text{NH}}_{\text{3}}\text{Cl}\right]$ to the initial buffer solution will decrease the $\text{pH}$”.

(d)

Interpretation Introduction

Interpretation: To justify if the given statements are true or false.

Concept introduction: The buffer solution is a solution contains weak acid and conjugate base or weak base and conjugated acid. It resists the change in pH.

To determine: The authenticity of the given statement, “If $\left[{\text{CH}}_{\text{3}}{\text{NH}}_2\right]<\left[{\text{CH}}_{\text{3}}{\text{NH}}_3^{+}\right]$ then $\text{pH}<3.36$”.

(e)

Interpretation Introduction

Interpretation: To justify if the given statements are true or false.

Concept introduction: The buffer solution is a solution contains weak acid and conjugate base or weak base and conjugated acid. It resists the change in pH.

To determine: The authenticity of the given statement, “If $\left[{\text{CH}}_{\text{3}}{\text{NH}}_2\right]=\left[{\text{CH}}_{\text{3}}{\text{NH}}_3^{+}\right]$ then $\text{pH}=10.64$”.