Chapter 16, Problem 41PE

Interpretation Introduction

Interpretation:

Whether mixture of ${\text{Na}}_{\text{2}}{\text{SO}}_{\text{4}}$ and $\text{Pb}{\left({\text{NO}}_{\text{3}}\right)}_{\text{2}}$ forms precipitate or not has to be calculated.

Concept Introduction:

As two substances get mixed, their molarity changes and volume gets added up. Thus, formula used to calculate new concentration of different substances is as follows:

  $M_{\text{i}}{V}_{\text{i}}=M_{\text{v}}{V}_{\text{v}}$

Here,

$M_{\text{i}}$ is initial molarity

$V_{\text{i}}$ is initial volume

$M_{\text{v}}$ is final molarity

$V_{\text{v}}$ is final volume

Equilibrium quotient is denoted with $\text{Q}$ and is product of concentration of ions raised to proper power of new molecule formed by mixture of two molecules. It explains about two major points that are as follows:

  $\begin{array}{l}\text{Q}>K_{s\text{p}}\text{ precipitation occurs}\\ \text{Q}<K_{s\text{p}}\text{ no precipitation}\end{array}$