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Freezing Point Depression Calculator

Chemistry
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Calculates the freezing point depression of a solution using the colligative properties formula. This calculator determines the change in freezing point when a nonvolatile solute is added to a solvent.

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How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Cryoscopic Constant (Kf), Molality of Solution (m), van't Hoff Factor (i), and Freezing Point of Pure Solvent in the units shown.

Step 2

Read Freezing Point Depression (ΔTf) and Freezing Point of Solution in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Water & NaCl

Cryoscopic Constant (Kf): 1.86 °C kg/mol; Molality of Solution (m): 1 mol/kg; van't Hoff Factor (i): 2; Freezing Point of Pure Solvent: 0 °C

Freezing Point Depression (ΔTf): 3.72 °C; Freezing Point of Solution: -3.72 °C

Water & Glucose

Cryoscopic Constant (Kf): 1.86 °C kg/mol; Molality of Solution (m): 0.5 mol/kg; van't Hoff Factor (i): 1; Freezing Point of Pure Solvent: 0 °C

Freezing Point Depression (ΔTf): 0.93 °C; Freezing Point of Solution: -0.93 °C

Benzene & Anthracene

Cryoscopic Constant (Kf): 5.12 °C kg/mol; Molality of Solution (m): 0.2 mol/kg; van't Hoff Factor (i): 1; Freezing Point of Pure Solvent: 5.5 °C

Freezing Point Depression (ΔTf): 1.024 °C; Freezing Point of Solution: 4.476 °C

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