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 for concentration in chemistry.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( conc \) — 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: Accurate molarity calculations are essential for preparing solutions with precise concentrations, conducting chemical reactions, and performing quantitative analyses.

4. Using the Calculator

Tips: Enter concentration in g/L and molecular weight in 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, 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: This calculator uses g/L. For other units (mg/mL, μg/μL), convert to g/L first (1 mg/mL = 1 g/L).

Q4: How precise should my measurements be?
A: Use at least 3-4 significant figures for accurate results, especially for dilute solutions.

Q5: What if my compound is a hydrate?
A: Include the water molecules in the molecular weight calculation (e.g., CuSO₄·5H₂O).