1. What is Molarity?

Molarity (M) is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per liter of solution. It's one of the most commonly used units of concentration in chemistry.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( Density \) — Density of the solution (g/mL)
• \( MW \) — Molecular weight of the solute (g/mol)

Explanation: The formula converts density (g/mL) to g/L by multiplying by 1000, then divides by molecular weight to get moles per liter (mol/L).

3. Importance of Molarity Calculation

Details: Molarity is crucial for preparing solutions with precise concentrations, performing chemical reactions, and calculating dilutions in laboratory and industrial settings.

4. Using the Calculator

Tips: Enter density in g/mL and molecular weight in g/mol. Both values must be positive numbers. The calculator is most accurate for pure substances.

5. Frequently Asked Questions (FAQ)

Q1: Can I use this for solutions or just pure substances?
A: This calculator is designed for pure substances. For solutions, you would need to account for the concentration of the solute.

Q2: Why multiply density by 1000?
A: We multiply by 1000 to convert g/mL to g/L, since molarity is defined per liter of solution.

Q3: What's the difference between molarity and molality?
A: Molarity is moles per liter of solution, while molality is moles per kilogram of solvent. They differ when temperature changes affect volume.

Q4: How accurate is this calculation?
A: The calculation is mathematically exact for pure substances if you have accurate density and molecular weight values.

Q5: Can I calculate molarity from mass and volume directly?
A: Yes, using M = (Mass / MW) / Volume, but this calculator uses density instead for convenience with pure substances.