Question

Derive an equilibrium relationship (y = f (x)) with relative volatility in the ideal solution

Answer 1

Step 1

Vapor pressure of ideal solution is:

Relative volatility is denoted by alpha as follows:

Where, is vapor pressure of solvent

is vapor pressure of pure solvent

is mole fraction of solvent.

x_B is mole fraction of solute.

is mole fraction of solvent in volatile phase.

is mole fraction of solute in volatile phase.

Step 2

Now,

and

Step 3

Putting the values of equation 2 and 3 in equation 1 as follows:

Where, and are volatile pressure of solvent and solute.

Hence, relationship of relative volatility been derived.