Chapter 13, Problem 13.31P

Interpretation Introduction

Interpretation:

Three binary systems having Bancroft point are to be identified along with their $T\text{ and }P$ coordinates.

Concept Introduction:

Bancroft Point is a temperature at which the vapor pressure $\left(P_i{}^{\text{sat}}\right)$ of both the species present in a binary system are equal. At this point, azeotropy is certain to happen.

Antoine equation is used to determine the vapor pressure of any substance at the given temperature by the equation:

  $\ln P^{\text{sat}}\left(\text{kPa}\right)=A-\frac{B}{\left(T^{\circ }\text{C}\right)+C}$ .....(1)

Here, $A,B\text{ and }C$ are the constants specific for a substance given in table B.2 of appendix B.