,
p1
= x1 p1
0
(1 22)
The reduction in the vapour pressure of solvent (Dp1) is given as:
Dp1 = p1
0 – p1 = p1
0 – p1
0 x1
= p1
0 (1 – x1)
(1 23)
Knowing that x2 = 1 – x1, equation (1 23) reduces to
Dp1 = x2 p1
0
(1