Chapter 17, Problem 17.86AP

Interpretation Introduction

Interpretation: The concentration ratio of the free ${\text{Pb}}^{2+}\left(aq\right)$ in the blood to the less toxic ${\text{Pb}}^{2+}-\text{EDTA}$ complex is to be calculated.

Concept introduction: The ratio of the ${\text{Pb}}^{2+}\left(aq\right)$ to the ${\text{Pb}}^{2+}-\text{EDTA}$ complex is calculated by the formula,

$\frac{\left[{\text{Pb}}^{2+}\right]}{{\left[\text{Pb}\left(\text{EDTA}\right)\right]}^{2-}}=\frac{1}{K_{\text{f}}\times {\left[\text{EDTA}\right]}^{4-}}$

To determine: The concentration ratio of the free ${\text{Pb}}^{2+}\left(aq\right)$ in the blood to much less toxic ${\text{Pb}}^{2+}-\text{EDTA}$ complex.