Chapter 18, Problem 131CP

Interpretation Introduction

Interpretation: The equilibrium concentration of ${\text{Pb}}_{\text{(aq)}}^{\text{2+}}$ in solution needs to be determined, if the initial concentration of ${\text{Pb}}_{\text{(aq)}}^{\text{2+}}$ is 0.0050 M, 0.075 M ${\text{H}}_{\text{2}}{\text{EDTA}}_{\text{(aq)}}^{\text{2-}}$ with buffered at pH 7.00.

  ${\text{Pb}}_{\text{(aq)}}^{\text{2+}}{\text{+ H}}_{\text{2}}{\text{EDTA}}_{\text{(aq)}}^{\text{2-}}\rightleftharpoons {\text{PbEDTA}}_{\text{(aq)}}^{\text{2-}}{\text{+ 2 H}}_{\text{(aq)}}^{\text{+}}$

Concept Introduction: A reversible chemical reaction is the chemical reaction that can proceed in either directions.The equilibrium stage of a reversible reaction is the stage at which the rate of forward and backward reaction becomes equal to each other.

The equilibrium state of chemical reaction can be expressed in terms of equilibrium constant which is the ratio of equilibrium concentration of product and reactant.

  ${\text{K}}_{\text{eq}}\text{ = }\frac{\text{[Product]}}{\text{[Reactant]}}$