Chapter 5, Problem 5.54P

Interpretation Introduction

Interpretation:

The value of B in Davies equation has to be estimated using the mean activity coefficients of $HBr$ in 3 dilute solutions.

Concept Introduction:

Generally, the ionic strength of solution is written as half of sum over all the ions present in it.

$\begin{array}{l}I=\frac{1}{2}\left(z_{+}^2{b}_{+}+z_{-}^2{b}_{-}\right)/b^{\text{'}}\\ here,I=Ionicstrength\\ z_{+}^{},z_{-}^{}=C\text{harge}numbers\\ b=molality\end{array}$

For more concentrated solution that is about more than ${10}^{-3}mold{m}^{-3}$ ion- ion interaction, the Davies equation is used and the equation is as follows,

$\log \left({\gamma }_{\underset{\_}{+}}\right)=-\frac{A\left|z_{+}^{}{z}_{-}^{}\right|I^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}{1+B{I}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$2$}\right.}}+CI$