Freezing point depression

K_f=(N_0 k T_0^2)/(a H_f)

N_0≡Avogadro constant

k≡Boltzmann constant

T_0≡Freezing point of pure solvent(Kelvin)

a≡mole number per unit mass of solvent

H_f≡Heat of fusion of solvent per mole

For water

N_0 = 6.022 142 * 10^23 mole^-1

k = 1.380 650 * 10^-23 J K^-1

T_0 = 273.15 K

a = 5.550 84 * 10^1 mole Kg^-1

H_f = 6.009 0 * 10^3 J mole^-1

K_f = 1.859 8 K Kg mole^-1

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