The ebullioscopic constant or molar boiling point rise constant (Kb) is a term of chemical thermodynamics, which shows the relationship between the boiling point increase of a substance and the molality. The expression for the ebullioscopic constant is: K b = & # x0394; T m ⋅ i {\displaystyle K_{b}={\frac {\Delta T}{m\cdot i}}}
where ΔT represents the boiling point increase in ° C, m represents the molality in mol / kg and the 't Hoff factor. The unit of constant is ° C × kg × mole.
Historically, the ebullioscopic constant is interesting because it was one of the first methods to determine the molecular weight of compounds. The formula follows that the boiling point increase is proportional to the concentration of the substance expressed in m.kg. With this data, the number of moles can be determined from the boiling point increase. The solution is made by weighing a known amount of dust. With the mass and the number of moles known, the molar mass can be easily determined. Today, mass spectrometry is the most widely used alternative to ebullioscopy. Ebullioscopic constant of some substances
See "List of Solvents" for a wider list of constants Also see
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