Ebullioscopic constant


In thermodynamics, the ebullioscopic constant relates molality to boiling point elevation. It is the ratio of the latter to the former:
A formula to compute the ebullioscopic constant is:
Through the procedure called ebullioscopy, a known constant can be used to calculate an unknown molar mass. The term ebullioscopy comes from the Latin language and means "boiling measurement". This is related to cryoscopy, which determines the same value from the cryoscopic constant.
This property of elevation of boiling point is a colligative property. It means that the property, in this case, depends on the number of particles dissolved into the solvent and not the nature of those particles.

Values for some solventsP. W. Atkins, ''Physical Chemistry'', 4th Ed., p. C17 (Table 7.2)

Solvent
Acetic acid3.08
Benzene2.53
Camphor5.95
Carbon disulfide2.34
Carbon tetrachloride5.03
Chloroform3.63
Cyclohexane2.79
Diethyl ether2.02
Ethanol1.07
Water0.512