Ebullioscopic constant


Ebullioscopic constant

In thermodynamics, the ebullioscopic constant, Kb, allows one to relate molality to boiling point elevation. It is the ratio of the latter to the former:

riangle T = K_b * m

Through the procedure called ebullioscopy, a known constant can be used to calculate an unknown molar mass. The term "ebullioscopy" comes from the Greek language and means "boiling measurement." This is related to cryoscopy, which determines the same value from the cryoscopic constant (of freezing point depression).

ome Kb values

*0.512 Water
*5.03 Carbon tetrachloride
*3.63 Chloroform
*2.53 Benzene
*2.34 Carbon disulfide
*2.02 Diethyl ether
*5.95 Camphor
*3.08 Acetic acid
*2.79 Cyclohexane
*1.07 Ethanol

ee also

* Ebullioscope
* List of boiling and freezing information of solvents


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  • ebullioscopic constant — virimo temperatūros pakilimo konstanta statusas T sritis fizika atitikmenys: angl. boiling constant; ebullioscopic constant vok. ebullioskopische Konstante, f; molale Siedepunkterhöhung, f rus. молальное повышение температуры кипения, n;… …   Fizikos terminų žodynas

  • Cryoscopic constant — In thermodynamics, the cryoscopic constant, Kf, allows one to relate molality to freezing point depression. It is the ratio of the latter to the former: where i is the van t Hoff factor, the number of particles the solute splits into or forms… …   Wikipedia

  • boiling constant — virimo temperatūros pakilimo konstanta statusas T sritis fizika atitikmenys: angl. boiling constant; ebullioscopic constant vok. ebullioskopische Konstante, f; molale Siedepunkterhöhung, f rus. молальное повышение температуры кипения, n;… …   Fizikos terminų žodynas

  • Boiling-point elevation — describes the phenomenon that the boiling point of a liquid (a solvent) will be higher when another compound is added, meaning that a solution has a higher boiling point than a pure solvent. This happens whenever a non volatile solute, such as a… …   Wikipedia

  • Molar mass — Formula mass redirects here. It is not to be confused with Mass formula. Molar mass, symbol M,[1] is a physical property of a given substance (chemical element or chemical compound), namely its mass per amount of substance.[2] The base SI unit… …   Wikipedia

  • Freezing-point depression — This article deals with melting and freezing point depression due to mixture of another compound. For depression due to small particle size, see melting point depression. Freezing point depression describes the phenomenon in which the freezing… …   Wikipedia

  • Colligative properties — are properties of solutions that depend on the number of molecules in a given volume of solvent and not on the properties/identity (e.g. size or mass) of the molecules.[1] Colligative properties include: relative lowering of vapor pressure;… …   Wikipedia

  • constante ébulliométrique — virimo temperatūros pakilimo konstanta statusas T sritis fizika atitikmenys: angl. boiling constant; ebullioscopic constant vok. ebullioskopische Konstante, f; molale Siedepunkterhöhung, f rus. молальное повышение температуры кипения, n;… …   Fizikos terminų žodynas

  • constante ébullioscopique — virimo temperatūros pakilimo konstanta statusas T sritis fizika atitikmenys: angl. boiling constant; ebullioscopic constant vok. ebullioskopische Konstante, f; molale Siedepunkterhöhung, f rus. молальное повышение температуры кипения, n;… …   Fizikos terminų žodynas

  • ebullioskopische Konstante — virimo temperatūros pakilimo konstanta statusas T sritis fizika atitikmenys: angl. boiling constant; ebullioscopic constant vok. ebullioskopische Konstante, f; molale Siedepunkterhöhung, f rus. молальное повышение температуры кипения, n;… …   Fizikos terminų žodynas