Important Relations Concerning Elevation In Boiling Point
(1) The elevation of boiling point is directly proportional to the lowering of vapour pressure, i.e., 
(2) 
where 
molal elevation constant or ebullioscopic constant of the solvent; 
Molality of the solution, i.e., number of moles of solute per 
of the solvent; 
Elevation in boiling point
(3) 
or 
where, 
is molal elevation constant and defined as the elevation in b.pt. produced when 1 mole of the solute is dissolved in 1 kg of the solvent.
and 
are the weights of solute and solvent and 
is the molecular weight of the solute.
(4) 
where 
Normal boiling point of the pure solvent; 
Latent heat of evaporation in 
of pure solvent; for water is 
.
