Raoult's laws

Raoult's first law
$$ \Delta p = p_0 \cdot \frac {n_2}{n_1} $$

Δp = pressure difference, p0 = original pressure, n2 = number of solute particles, n1 = number of solvent particles.

Raoult's second law
Dissolving a substance in a solvent increases its boiling point.

$$ \Delta T_v = K_e \cdot c_m $$

Ke = solvent ebullioscopic constant, cm = solute concentration.

Raoult's third law
Dissolving a substance in a solvent lowers its freezing point.

$$ \Delta T_v = - K_r \cdot c_m $$

Kr is the cryoscopic constant of the solvent.

Source

 * KUBATOVA, Senta. Biofot [online]. [cit. 2011-01-31]. .
 * KUBATOVA, Senta. Biofot [online]. [cit. 2011-01-31]. .