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Freezing-point depression

작성자 Uploader : atom 작성일 Upload Date: 2018-09-12변경일 Update Date: 2018-09-13조회수 View : 752

Freezing-point depression is the decrease of the freezing point of a solvent on addition of a non-volatile solute. Examples include salt in water, alcohol in water, or the mixing of two solids such as impurities into a finely powdered drug. In the last case, the added compound is the solute, and the original solid is thought of as the solvent. The resulting solution or solid–solid mixture has a lower freezing point than the pure solvent or solid. This phenomenon is what causes sea water, (a mixture of salt [and other things] in water) to remain liquid at temperatures below 0 °C (32 °F), the freezing point of pure water.

ΔTf = Tfs - Tf

ΔTf = m*Kf

ΔTf : temperature decrement by freezing point depression (℃)
Tf : freezing point of solution (℃)
Tfs : freezing point of solvent (℃)
m : molality (mol/kg)
kf : cryoscopic constant (℃/m)

*** 참고문헌[References] ***

https://en.wikipedia.org/wiki/Freezing-point_depression

ΔTf = m*Kf

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변수명 Variable	변수값 Value	변 수 설 명 Description of the variable

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현재 위치

Freezing-point depression

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