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Freezing point (°C) K f (°C⋅kg/mol) Data source; Aniline: 184.3 3.69 –5.96 –5.87 K b & K f [1] ... Freezing-point depression; Boiling-point elevation; References
In principle, the boiling-point elevation and the freezing-point depression could be used interchangeably for this purpose. However, the cryoscopic constant is larger than the ebullioscopic constant, and the freezing point is often easier to measure with precision, which means measurements using the freezing-point depression are more precise.
Triple point: 291.8 K (18.7 °C), ~99500 Pa Critical point: 850 K (577 °C), 7500 kPa Std enthalpy change of fusion, Δ fus H o: 18.28 kJ/mol Std entropy change of fusion, Δ fus S o: 62.7 J/(mol·K) Std enthalpy change of vaporization, Δ vap H o: 91.7 kJ/mol Std entropy change of vaporization, Δ vap S o: 201 J/(mol·K) Solid properties Std ...
The term "cryoscopy" means "freezing measurement" in Greek. Freezing point depression is a colligative property, so ΔT depends only on the number of solute particles dissolved, not the nature of those particles. Cryoscopy is related to ebullioscopy, which determines the same value from the ebullioscopic constant (of boiling point elevation).
On the other hand, some constants, such as K f (the freezing point depression constant, or cryoscopic constant), depend on the identity of a substance, and so may be considered to describe the state of a system, and therefore may be considered physical properties. "Specific" properties are expressed on a per mass basis.
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While the minimum freezing point of a glycerol-water mixture is higher than an ethylene glycol-water mixture, glycerol is not toxic and is being re-examined for use in automotive applications. [34] [35] In the laboratory, glycerol is a common component of solvents for enzymatic reagents stored at temperatures below 0 °C (32 °F) due to the ...
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