Interfacial Tension in an Extraction System. Equilibrium data

for the system water $($A$)$acetic acid $($C$)$isopropyl ether $($B$)$ are

given in Appendix A$\mathrm{.}3-24.$ Using the data in dilute solution, where

the wt fraction of acetic acid in the water$-$rich phase is $0\mathrm{.}69\%,$

calculate the interfacial tension. Hint $isin$ example $27\mathrm{.}3-2$