Formula Used:
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Definition: This method measures the relative lowering of vapour pressure when a non-volatile solute is added to a solvent.
Purpose: It helps determine the effect of solutes on vapour pressure, which is important in colligative properties studies.
The calculator uses the formula:
Where:
Explanation: The mass loss in set B (containing solution) divided by the total mass loss gives the relative lowering of vapour pressure.
Details: Vapour pressure lowering affects boiling point elevation, freezing point depression, and osmotic pressure - all important colligative properties.
Tips: Enter the mass loss from bulb set A (pure solvent) and bulb set B (solution). Both values must be ≥ 0 and their sum must be > 0.
Q1: What do bulb sets A and B represent?
A: Set A contains pure solvent, while set B contains the solution being studied.
Q2: Why is this method called "dynamic"?
A: Because it involves a continuous flow of dry air through the system, creating dynamic equilibrium conditions.
Q3: What units should be used for mass measurements?
A: The calculator uses kilograms, but consistent units can be used as long as both measurements are in the same unit.
Q4: What does the result represent?
A: The result (Δp) represents the fraction by which the vapour pressure is lowered compared to the pure solvent.
Q5: Can this method be used for volatile solutes?
A: No, this method is specifically for non-volatile solutes. For volatile solutes, other methods must be used.