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 and biology.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( m \) — Mass of solute (g)
• \( MW \) — Molecular weight of solute (g/mol)
• \( V \) — Volume of solution (L)

Explanation: The formula calculates how many moles of solute are present in each liter of solution.

3. Importance of Molarity Calculation

Details: Accurate molarity calculations are essential for preparing solutions with precise concentrations, which is critical for experiments, chemical reactions, and biological assays.

4. Using the Calculator

Tips: Enter mass in grams, molecular weight in g/mol, and volume in liters. 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: How do I convert molarity to other concentration units?
A: For weight/volume percent, multiply molarity by MW and divide by 10. For ppm, multiply molarity by MW and by 1000.

Q3: Why is molecular weight important?
A: Molecular weight converts between grams and moles, allowing you to relate the mass of a substance to the number of molecules present.

Q4: Can I use this for dilutions?
A: Yes, you can calculate the molarity of stock solutions, then use \( M_1V_1 = M_2V_2 \) for dilution calculations.

Q5: What if my volume is in mL?
A: Convert mL to L by dividing by 1000 before entering the value (1 mL = 0.001 L).