Q$\mathrm{.}1.$ The feed stream containing $25\%$ acetic acid $($A$)$ and $75\%$ chloroform $($B$)$ by mass is fed to a counter$-$

current extraction system and pure water $($C$)$ is used as solvent. At the end of the extraction process, acetic

acid is obtained as $5\%$ by mass in raffinate phase. The extract stream is sent to a separator to separate all

the water and then the remaining extract contains $85\%$ acetic acid.

Equilibrium data for the ternary acetic acid $-$chloroform$-$ water system is given in the table.

a$)$ Obtain the equilibrium line and show tie$-$lines for the given system.

b$)$ Find the number of stages for the given process.

c$)$ What is solvent$/$feed $($S$/$F$)$ ratio for the system?

Could you please answer with triangle method?