Chapter 5, Problem 5F.5BE

Interpretation Introduction

Interpretation: The ionic strength of a solution that is $\text{0}\text{.040}\text{mol}{\text{kg}}^{\text{-1}}$ in ${\text{K}}_3\left[\text{Fe}{\left(\text{CN}\right)}_{\text{6}}\right]\left(\text{aq}\right)$ and $\text{0}\text{.030}\text{mol}{\text{kg}}^{\text{-1}}$ in $\text{KCl}\left(\text{aq}\right)$ and $\text{0}\text{.050}\text{mol}{\text{kg}}^{\text{-1}}$ in $\text{NaBr(aq)}$ has to be calculated.

Concept introduction: The ionic strength is introduced in the Debye-Huckel limiting law which relates the activity coefficient as a function of the ionic strength of the solution.  It is dependent on the concentration of all the ions present in the solution.  It is a dimensionless quantity.