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sci.freezing-point-depression Calculator
Calculates freezing point depression ΔTf = Kf × m × i from molal concentration and cryoscopic constant. Water's Kf = 1.86 °C·kg/mol — road salt (NaCl, i=2) at 1 mol/kg depresses the freezing point 3.72 °C, effective down to about −9 °C before losing efficacy.
Inputs
Solute Mass G
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Solvent Mass G
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Molar Mass G Mol
Mass of one mole of the substance (g/mol). Found by summing atomic weights. Converts between grams and moles.
Kf C Kg Mol
Reference formula or conversion factor shown for context.
Vant Hoff I
A multiplier applied in the calculation.
Results
freezing point depression ΔTf (°C)
Sample size or count used in the calculation.
molality (mol/kg)
Reference formula or conversion factor shown for context.
new freezing point (water - ΔT)
The value at the specified point or condition.
ΔTf = i·Kf·m
Reference formula or conversion factor shown for context.