Formula
ΔTf=i Kf m; Tf=Tf,pure−ΔTf.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Dilute ideal-solution model; the van ’t Hoff factor is an input, not inferred from a formula.
Example Calculation
Example inputs
- Solvent Kf: 1.86 K·kg/mol
- Molality: 1 mol/kg
- van ’t Hoff factor: 2
- Pure-solvent freezing point: 0 °C
Kf=1.86, molality 1 and i=2 predict a 3.72 K decrease.
Method references
Frequently asked questions
How do I use this calculator?
Enter solvent kf, molality, van ’t hoff factor, pure-solvent freezing point. The result updates automatically. Use Reset to restore the example values.
What method does it use?
ΔTf=i Kf m; Tf=Tf,pure−ΔTf.. Dilute ideal-solution model; the van ’t Hoff factor is an input, not inferred from a formula.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.