Total Pressure of Mixture of Liquid with Water given Vapour Pressure of Water Calculator

Total Pressure Formula:

\[ P_{total} = P_{water} + \left( \frac{W_B \times P_{water} \times M_{water}}{W_{water} \times M_B} \right) \]

Partial Pressure of Pure Water:

Weight of Liquid B:

Molecular Mass of Water:

kg/mol

Weight of Water:

Molecular Mass of Liquid B:

kg/mol

Total Pressure (Pa):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is Total Pressure of Mixture of Liquid with Water?

Definition: This calculator determines the total pressure exerted by a mixture of water and an immiscible liquid based on their weights and molecular masses.

Purpose: It helps in chemical engineering and physical chemistry calculations involving immiscible liquid mixtures.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_{total} = P_{water} + \left( \frac{W_B \times P_{water} \times M_{water}}{W_{water} \times M_B} \right) \]

Where:

\( P_{total} \) — Total pressure of the mixture (Pa)
\( P_{water} \) — Partial pressure of pure water (Pa)
\( W_B \) — Weight of liquid B (kg)
\( M_{water} \) — Molecular mass of water (kg/mol)
\( W_{water} \) — Weight of water in mixture (kg)
\( M_B \) — Molecular mass of liquid B (kg/mol)

Explanation: The total pressure is the sum of water's vapor pressure and the pressure contribution from the other liquid.

3. Importance of Pressure Calculation

Details: Accurate pressure calculations are crucial for designing distillation systems, understanding phase behavior, and predicting vapor-liquid equilibria.

4. Using the Calculator

Tips: Enter all required values in appropriate units. The molecular mass of water defaults to 0.018 kg/mol (18 g/mol). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What are immiscible liquids?
A: Liquids that don't mix to form a homogeneous solution (e.g., oil and water).

Q2: Why does each liquid contribute independently to pressure?
A: Immiscible liquids exert their own vapor pressures independently as if the other liquid wasn't present.

Q3: What's a typical molecular mass for water?
A: 0.018 kg/mol (18 g/mol), which is the default value in the calculator.

Q4: How do I find the partial pressure of pure water?
A: Use vapor pressure tables or Antoine equation at the given temperature.

Q5: Can this be used for miscible liquids?
A: No, this formula is specifically for immiscible liquid mixtures.