Kā aprēķināt Freezing Point Depression
Kas ir Freezing Point Depression?
Freezing point depression is a colligative property: adding a solute to a pure solvent lowers the freezing point. ΔTf = i × Kf × m, where i is the van't Hoff factor, Kf is the cryoscopic constant, and m is molality.
Soli pa solim ceļvedis
- 1ΔTf = i × Kf × m (molality, not molarity)
- 2Kf(water) = 1.86 °C·kg/mol
- 3Molality m = moles solute / kg solvent
- 4van't Hoff factor i = number of particles per formula unit (1 for glucose, 2 for NaCl, 3 for CaCl₂)
Worked Examples
Ievade
1 mol NaCl in 1 kg water · i=2 · Kf=1.86
Rezultāts
ΔTf = 3.72°C → freezes at −3.72°C
2×1.86×1=3.72°C depression
Vai esat gatavs aprēķināt? Izmēģiniet bezmaksas Freezing Point Depression kalkulatoru
Izmēģiniet to pats →