Ebullioscopic constant

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

<math>\triangle T = K_b * m</math>

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).

Some K_b 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

See also

• List of boiling and freezing information of solvents

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