Chapter 5, Problem 5C.9P

Interpretation Introduction

Interpretation:

Whether phase separation would be expected if excess enthalpy is modeled by the expression, $H^{\text{E}}=\xi RT{x}_{\text{A}}^2{x}_{\text{B}}^2$ has to be predicted.

Concept introduction:

In ideal mixing, the value of enthalpy should be zero, $\Delta H_{\text{mix}}=0$.  In non ideal mixing, the value of enthalpy deviates from zero.  In case the value of enthalpy is greater than zero, the mixing between solutions will be less.  If the value of enthalpy is less than zero, mixing between solutions will be more.