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)
• \( Density \) — Solution density (g/mL)
• \( Weight\% \) — Weight percentage of solute (%)
• \( MW \) — Molecular weight of solute (g/mol)

Explanation: The formula converts weight percentage to molarity by accounting for the solution's density and the solute's molecular weight.

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, weight percentage (without % sign), and molecular weight in g/mol. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molarity and molality?
A: Molarity is moles per liter of solution, while molality is moles per kilogram of solvent. Molarity is temperature-dependent (volume changes with temperature), while molality is not.

Q2: Why multiply by 1000 in the formula?
A: The 1000 converts g/mL to g/L (since 1 mL = 0.001 L, and we need per liter for molarity).

Q3: Can I use this for any solute?
A: Yes, as long as you know the exact molecular weight and the solution's density and weight percentage.

Q4: How accurate is this calculation?
A: The accuracy depends on the precision of your input values. For very precise work, temperature corrections may be needed.

Q5: What if my weight percentage is very low?
A: The formula works for any concentration, but for very dilute solutions, molality might be more appropriate.