Chapter 18, Problem 85CP

Interpretation Introduction

Interpretation: The count rate of ${\text{Hg}}_{\text{2}}{\text{I}}_{\text{2}}$ sample is given. An excess amount of ${\text{Hg}}_{\text{2}}{\text{I}}_{\text{2}}$ is placed into some water and the solid is allowed to equilibrate with its respective ions. A sample of this solution is withdrawn and the radioactivity is measured. The value of $K_{\text{sp}}$ for ${\text{Hg}}_{\text{2}}{\text{I}}_{\text{2}}$ is to be calculated.

Concept introduction:

Solubility product describes the equilibrium relationship between the solid and the ions produced by its dissolution. Higher the $K_{\text{sp}}$, more soluble is the substance.

To determine: The solubility product $\left(K_{\text{sp}}\right)$ for ${\text{Hg}}_{\text{2}}{\text{I}}_{\text{2}}$.