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ChemBench
The chemistry of why salt melts ice.
Dissolved particles disrupt the solvent's ability to form an ordered solid, so a lower temperature is needed to freeze — this is exactly why salted roads and antifreeze work.
Road salt (NaCl) dissolves into water on the road, lowering the freezing point below the ambient temperature so ice melts and doesn't easily re-form — this calculator quantifies exactly how many degrees that shift is.
Molar mass of any chemical formula (e.g. H2O, C6H12O6, Ca(OH)2).
OpenPercent composition of an element within a chemical formula.
OpenSimplest whole-number ratio formula from elemental masses or percentages.
OpenPercent yield from actual and theoretical reaction yields.
OpenFreezing point depression
3.72 °C
What you entered
ΔTf = i × Kf × m
2 × 1.86 × 1= 3.72 °CResult
Freezing point depression: 3.72 °C
This solution's freezing point drops by 3.72°C below pure solvent — this is why salt melts ice.