Chapter 17, Problem 17.134QP

(a)

Interpretation Introduction

Interpretation:

The major components at indicated points in titration curve has to be identified and ${\text{pK}}_{\text{a}}$ of acids has to be calculated.

Concept introduction:

• ${\text{pK}}_{\text{a}}$ is defined as negative logarithm of acid dissociation constant( ${\text{K}}_{\text{a}}$).  ${\text{pK}}_{\text{a}}\text{=}{\text{-log}}_{\text{10}}{\text{(K}}_{\text{a}}\text{)}$
• $\text{pH}\text{=}{\text{pK}}_{\text{a}}\text{+}\text{log}\frac{\text{[conjugate base]}}{\text{[acid]}}$ is Henderson-Hasselbalch equation.
• The point at which amount of standard solution and analyte becomes equal and neutralisation happens in titration is called equivalence point.

To identify: The major components at indicated points in titration curve.

(b)

Interpretation Introduction

Interpretation:

The major components at indicated points in titration curve has to be identified and ${\text{pK}}_{\text{a}}$ of acids has to be calculated.

Concept introduction:

• ${\text{pK}}_{\text{a}}$ is defined as negative logarithm of acid dissociation constant( ${\text{K}}_{\text{a}}$).  ${\text{pK}}_{\text{a}}\text{=}{\text{-log}}_{\text{10}}{\text{(K}}_{\text{a}}\text{)}$
• $\text{pH}\text{=}{\text{pK}}_{\text{a}}\text{+}\text{log}\frac{\text{[conjugate base]}}{\text{[acid]}}$ is Henderson-Hasselbalch equation.
• The point at which amount of standard solution and analyte becomes equal and neutralisation happens in titration is called equivalence point.

To calculate: The ${\text{pK}}_{\text{a}}$ of acids.