Chapter 18, Problem 82QAP

Interpretation Introduction

Interpretation:

The ${\text{K}}_{\text{sp}}$ value of ${\text{Hg}}_{\text{2}}{\text{I}}_{\text{2}}$ should be determined.

Concept introduction:

Activity is defined as the product of rate constant and number of atoms. It is also defined as the rate of decay or expresses number of atoms decays in unit time.

The mathematical expression is given by:

$\text{A = kN}$

Where, A = activity, k = first order rate constant and N = number of radioactive nuclei.

Activity can be expressed in following units:

1 Bq = 1 atom/s

1 Ci = 3.700 × 10¹⁰ atoms/s

${\text{K}}_{\text{sp}}$ is the solubility product and it shows the degree of dissociation of compound. It is define as the product of concentration of ions (dissolved) raised to the power of their stoichiometric coefficients.

The mathematical expression is given by:

${\text{A}}_{\text{a}}{\text{+B}}_{\text{b}}\stackrel{}{\rightleftharpoons }{\text{aA}}^{\text{+}}{\text{+bB}}^{\text{+}}$

${\text{K}}_{\text{sp}}{\text{=[A}}^{\text{+}}{\text{]}}^{\text{a}}{{\text{[B}}^{\text{+}}\text{]}}^{\text{b}}$