1. What is Moles of Solute in Dilute Solution?

Definition: This calculator determines the number of moles of solute in a dilute solution based on the relative lowering of vapour pressure.

Purpose: It helps chemists and researchers understand solution properties and colligative effects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( n \) — Number of moles of solute (mol)
• \( p_o \) — Vapour pressure of pure solvent (Pa)
• \( p \) — Vapour pressure of solvent in solution (Pa)
• \( N \) — Number of moles of solvent (mol)

Explanation: The formula calculates solute moles based on how much the solute lowers the solvent's vapour pressure.

3. Importance of This Calculation

Details: Understanding this relationship is crucial for studying colligative properties and solution thermodynamics.

4. Using the Calculator

Tips: Enter the vapour pressures in Pascals and moles of solvent. Ensure pure solvent pressure is greater than solution pressure.

5. Frequently Asked Questions (FAQ)

Q1: What is relative lowering of vapour pressure?
A: It's the ratio (p₀-p)/p₀, representing how much the solute reduces the solvent's vapour pressure.

Q2: Why must the solution be dilute?
A: The formula assumes ideal behavior which is only valid for dilute solutions where solute-solute interactions are negligible.

Q3: What units should be used?
A: Pressure in Pascals (Pa) and amounts in moles (mol) for consistent results.

Q4: Can this be used for non-volatile solutes?
A: Yes, for non-volatile solutes, p would be the vapour pressure of the solvent above the solution.

Q5: How accurate is this calculation?
A: Very accurate for ideal, dilute solutions. Accuracy decreases for concentrated solutions or strong solute-solvent interactions.