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Q$.$ Minimum Solvent Requirenet

If $8000k\frac{g}{h}$ of an acetic acid $($c$)$ water $($A$)$ solution, containing $30\%$ acid, is to be countercurrently extracted with isopropy lether $($B$)$ to reduce the acid concentration to $2\%$ to the solvent Free raffinate produc $t.$ determine $6)$ minimum amount of solvent which can be used b$)$ the number of theortical stage if $30,000k\frac{g}{h}$ of solert is used hunter nosh method