What is meant by the freezing constant of ethanol 1.99 K Kg/ mil?
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For water, KF = 1.853 K·kg/mol.) b is the molality (moles solute per kilogram of solvent)
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Values of cryoscopic constants.
Compound Freezing point (°C) Kf in K⋅kg/mol
Ethanol −114.6 1.99
Ethyl ether −116.2 1.79
Naphthalene 80.2
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The cryoscopic constant of ethanol is 1.99 K kg mol-1, at -114. 3 oC This can also be found from the heat of fusion and freezing temperature (see any thermodynamics textbook). The freezing point depression (and boiling point elevation) is only dependent on the number of particles dissolved, not on their nature. Salts that decompose into many ions have therefore a larger freezing point depression, purely because they release more particles. I have no idea about the behavior of various salts in alcohol at that temperature. I attached a paper with conductance measurements to -45 oC. Maybe that helps.
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