Chapter 14, Problem 14.138MP

(a)

Interpretation Introduction

Interpretation:

The pH of the solution has to be determined.

Concept Introduction:

• According to ideal gas law,

$\text{PV=nRT}$

• Molarity: The concentration for solutions is expressed in terms of molarity as follows,

  $\text{Molarity = }\frac{\text{No}\text{. of moles of solute}}{\text{Volume of solution in L}}$

• Acid-dissociation constant for a weak acid, HA

$K_a=\frac{[H_3{O}^{+}][A^{-}]}{[HA]}$

• The $\text{pH}$ of a solution $=-\log [H_3{O}^{-}]$

(b)

Interpretation Introduction

Interpretation:

The volume that must be used to dilute the solution to the percent dissociation has to be determined and reason for the result of percent dissociation cannot be used has to be explained.

Concept Introduction:

• The $\text{pH}$ of a solution $=-\log [H_3{O}^{-}]$
• $\%dissociation=\sqrt{\frac{K_a}{{[HA]}_{initial}}}$