Chapter 17, Problem 17.69QP

(a)

Interpretation Introduction

Interpretation:

From the given data, the molar solubility of ${\text{Fe(OH)}}_{\text{2}}$ dissolved in various buffer solutions have to be calculated.

Concept introduction:

• Molar solubility is defined as amount of solute that can be dissolve in one litre of solution before it attains saturation.
• Solubility of a compound is expressed as concentration of its ions in saturated solution.
• Buffer solution is defined as a solution that oppose changes in $\text{pH}$ while adding little amount of either an acid or a base.  If a solution has to be buffer then it should be combination of a weak acid and its conjugate base or a weak base and its conjugate acid.
• $\text{pH}$ is the logarithm of the reciprocal of the concentration  of ${\text{H}}_{\text{3}}{\text{O}}^{\text{+}}$  in a solution.
•   $\text{pH}$ is used to determine the acidity or basicity of an aqueous solution.
• $\text{pH}\text{=}{\text{-log[H}}_{\text{3}}{\text{O}}^{\text{+}}\text{]}$

To calculate: The molar solubility of ${\text{Fe(OH)}}_{\text{2}}$ in buffer solution of $\text{pH 8}\text{.0}$

(b)

Interpretation Introduction

Interpretation:

From the given data, the molar solubility of ${\text{Fe(OH)}}_{\text{2}}$ dissolved in various buffer solutions have to be calculated.

Concept introduction:

• Molar solubility is defined as amount of solute that can be dissolve in one litre of solution before it attains saturation.
• Solubility of a compound is expressed as concentration of its ions in saturated solution.
• Buffer solution is defined as a solution that oppose changes in $\text{pH}$ while adding little amount of either an acid or a base.  If a solution has to be buffer then it should be combination of a weak acid and its conjugate base or a weak base and its conjugate acid.
• $\text{pH}$ is the logarithm of the reciprocal of the concentration  of ${\text{H}}_{\text{3}}{\text{O}}^{\text{+}}$  in a solution.
•   $\text{pH}$ is used to determine the acidity or basicity of an aqueous solution.
• $\text{pH}\text{=}{\text{-log[H}}_{\text{3}}{\text{O}}^{\text{+}}\text{]}$

To calculate: The molar solubility of ${\text{Fe(OH)}}_{\text{2}}$ in buffer solution of $\text{pH 10}\text{.0}$