Vapour Pressure of Liquid forming Immiscible Mixture with Water Calculator

Vapour Pressure Formula:

\[ P_B° = \frac{W_B \times P_{water}° \times M_{water}}{W_{water} \times M_B} \]

Weight of Liquid B:

Partial Pressure of Pure Water:

kPa

Molecular Mass of Water:

kg/mol

Weight of Water in Mixture:

Molecular Mass of Liquid B:

kg/mol

Vapour Pressure of Pure Component B (kPa):

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1. What is Vapour Pressure of Immiscible Liquid Mixture?

Definition: This calculator determines the vapour pressure of a liquid (B) that forms an immiscible mixture with water, based on their respective weights and molecular masses.

Purpose: It helps chemists and engineers understand the behaviour of immiscible liquid mixtures and predict their vapour pressures.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_B° = \frac{W_B \times P_{water}° \times M_{water}}{W_{water} \times M_B} \]

Where:

\( P_B° \) — Vapour pressure of pure component B (kPa)
\( W_B \) — Weight of liquid B (kg)
\( P_{water}° \) — Partial pressure of pure water (kPa)
\( M_{water} \) — Molecular mass of water (0.018 kg/mol)
\( W_{water} \) — Weight of water in mixture (kg)
\( M_B \) — Molecular mass of liquid B (kg/mol)

Explanation: The formula relates the vapour pressures of the components to their molecular masses and weights in the immiscible mixture.

3. Importance of Vapour Pressure Calculation

Details: Understanding vapour pressures is crucial for distillation processes, predicting boiling points, and designing separation systems for immiscible liquids.

4. Using the Calculator

Tips: Enter the weights of both liquids (in kg), the partial pressure of pure water (default 0.53 kPa), molecular mass of water (default 0.018 kg/mol), and molecular mass of liquid B. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are immiscible liquids?
A: Immiscible liquids are those that don't mix to form a homogeneous solution (like oil and water).

Q2: Why is water's molecular mass fixed at 0.018 kg/mol?
A: This is the standard molecular weight of water (H₂O = 18 g/mol = 0.018 kg/mol).

Q3: What's a typical partial pressure for pure water?
A: At room temperature (25°C), it's about 0.53 kPa, but this varies with temperature.

Q4: How do I find the molecular mass of my liquid?
A: Sum the atomic masses of all atoms in the molecule, or consult chemical reference tables.

Q5: Can this be used for miscible liquids?
A: No, this formula only applies to immiscible liquid mixtures.