Chapter 18, Problem 37E

Interpretation Introduction

Interpretation:

The percentage of Pb²⁺ remains in the given solution solution after PbCl₂precipitated and the [Cl^-] that needs to be maintained to make sure that only 1.0 % of the Pb²⁺ remains unprecipitated should be calculated.

Concept introduction:

The dissociation reaction of ${\text{PbCl}}_2$ is:

${\text{PbCl}}_2\text{(s)}\rightleftharpoons {\text{Pb}}^{\text{2+}}{\text{(aq) + 2Cl}}^{-}\text{(aq)}$

The expression for K_sp is:

${\text{K}}_{sp}={\left[{\text{Cl}}^{-}\text{(aq) }\right]}^2\left[{\text{ Pb}}^{\text{2+}}\text{(aq)}\right]$