Chapter 15, Problem 69QRT

(a)

Interpretation Introduction

Interpretation:

The $K_{\text{sp}}$ of $\text{Fe}{\left(\text{OH}\right)}_2$ has to be calculated in water.  The reason as to why the $K_{\text{sp}}$ differs from the experimental value has to be stated.

Concept Introduction:

Solubility product relates the solubility of a salt with the concentration of ions present in the salt.  Solubility product holds a direct relation with the solubility of the salt.  The solubility product is the ability of the solid to dissolve in aqueous solution.  The more the solubility product the more the solid dissolves in solution. It is denoted as $K_{\text{sp}}$.  It is known as solubility product constant.

(b)

Interpretation Introduction

Interpretation:

The concentration of ${\text{OH}}^{-}$ ions needed to precipitate ${\text{Fe}}^{\text{2+}}$ ions such that $1\text{μg}/\text{L}$ ${\text{Fe}}^{\text{2+}}$ concentration remains in the solution has to be calculated.

Concept Introduction:

Refer to concept of part (a).