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The proportionality constant, \(K_f\), is called the molal freezing-point depression constant. It is a constant that is equal to the change in the freezing point for a 1-molal solution of a nonvolatile molecular solute. For water, the value of \(K_f\) is \(-1.86^\text{o} \text{C}/\textit{m}\).
- Freezing Point Depression
The freezing point depression is the difference in...
- Boiling Point Elevation
Calculations involving the molal boiling point elevation...
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- Freezing Point Depression
According to Table \(\PageIndex{1}\), the molal boiling point elevation constant for water is 0.51°C/m. Thus a 1.00 m aqueous solution of a nonvolatile molecular solute such as glucose or sucrose will have an increase in boiling point of 0.51°C, to give a boiling point of 100.51°C at 1.00 atm.
freezing point depression: The difference in temperature between the freezing point of the pure solvent and that of the solution. molal freezing-point depression constant: A constant that is equal to the change in the freezing point for a 1-molal solution of a nonvolatile molecular solute.
16 paź 2021 · The freezing point depression formula uses the Clausius-Clapeyron equation and Raoult’s law. For a dilute ideal solution, the formula for freezing point depression is called Blagden’s law: ΔTf = iKfm. ΔT f is the temperature difference between normal freezing point and the new freezing point.
14 sie 2020 · According to Table \(\PageIndex{1}\), the molal boiling point elevation constant for water is 0.51°C/m. Thus a 1.00 m aqueous solution of a nonvolatile molecular solute such as glucose or sucrose will have an increase in boiling point of 0.51°C, to give a boiling point of 100.51°C at 1.00 atm.
A solution will solidfy (freeze) at a lower temperature than the pure solvent. This is the colligative property called freezing point depression. The more solute dissolved, the greater the effect. An equation has been developed for this behavior. It is: Δt = i K f m.
1 lip 2021 · K f = molal freezing point depression constant or cryoscopic constant in °C kg/mol. m = molality of the solute in mol solute/kg solvent. Step 1: Calculate the molality of the NaCl.
