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Relative Lowering of Vapour Pressure given Depression in Freezing Point Calculator

Formula Used:

\[ RLVP = \frac{ΔH_{fusion} \times ΔT_f}{[R] \times T_{fp} \times T_{fp}} \]

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1. What is Relative Lowering of Vapour Pressure?

Definition: The Relative Lowering of Vapour Pressure is the lowering of vapour pressure of pure solvent on addition of solute.

Purpose: This calculation helps understand how adding a solute affects the solvent's properties, important in colligative properties studies.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ RLVP = \frac{ΔH_{fusion} \times ΔT_f}{[R] \times T_{fp} \times T_{fp}} \]

Where:

Explanation: The formula relates the freezing point depression to the relative lowering of vapour pressure through thermodynamic principles.

3. Importance of This Calculation

Details: Understanding this relationship helps in predicting solution behavior, designing antifreeze solutions, and studying colligative properties.

4. Using the Calculator

Tips: Enter the molar enthalpy of fusion, freezing point depression, and solvent freezing point. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is typical value for molar enthalpy of fusion?
A: For water it's 333.5 kJ/mol, but varies by substance. Check thermodynamic tables for specific materials.

Q2: Why is the freezing point in Kelvin?
A: The formula requires absolute temperature. Remember 0°C = 273.15K.

Q3: What does a higher RLVP value indicate?
A: A higher value indicates greater lowering of vapour pressure relative to the pure solvent.

Q4: Can this be used for any solvent?
A: Yes, as long as you have the correct parameters for your specific solvent.

Q5: How accurate is this calculation?
A: It provides theoretical values for ideal solutions. Real solutions may show deviations.

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