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.

3. Importance of Molarity Calculation

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

4. Using the Calculator

Tips: Enter density in g/mL and molecular weight in g/mol. Both values must be positive numbers. The calculator will compute the molarity in mol/L.

5. Frequently Asked Questions (FAQ)

Q1: 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.

Q2: Can I use this for mixtures?
A: This calculator is for single-solute solutions. For mixtures, you need to know the exact composition and molecular weights of all components.

Q3: What temperature should density be measured at?
A: Density varies with temperature. Standard density values are typically reported at 20°C or 25°C.

Q4: Does this work for pure substances?
A: Yes, for pure substances in solution, this gives the molarity of the solution.

Q5: 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 in concentrated solutions.