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)
• \( C \) — Concentration (g/L)
• \( MW \) — Molecular weight (g/mol)

Explanation: The formula converts mass concentration to molar concentration by dividing by the molecular weight of the solute.

3. Importance of Molarity Calculation

Details: Molarity is essential for preparing solutions with precise concentrations, stoichiometric calculations in chemical reactions, and various analytical chemistry applications.

4. Using the Calculator

Tips: Enter concentration in grams per liter (g/L) and molecular weight in grams per mole (g/mol). Both 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 find the molecular weight of a compound?
A: Sum the atomic weights of all atoms in the molecule. For example, water (H₂O) has MW = (2×1.008) + 15.999 = 18.015 g/mol.

Q3: Can I use other concentration units?
A: Yes, but you'll need to convert them to g/L first. For example, mg/mL is equivalent to g/L (since 1 mg/mL = 1 g/L).

Q4: What if my solute is a mixture?
A: For mixtures, use the average molecular weight. For exact calculations, you'd need to know the exact composition.

Q5: How precise should my measurements be?
A: For most laboratory work, 3-4 significant figures are sufficient. The precision depends on your application requirements.