1. What is Molarity from Density?

Molarity (M) is a measure of the concentration of a solute in a solution, expressed as moles of solute per liter of solution. When you know the density of a solution and its percentage concentration, you can calculate its molarity using the molecular weight of the solute.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M \) — Molarity (mol/L)
• \( density \) — Solution density (g/mL)
• \( percentage \) — Percentage concentration (%)
• \( MW \) — Molecular weight of solute (g/mol)

Explanation: The formula converts percentage concentration to molarity by accounting for the mass of solute per volume of solution and converting to moles using the molecular weight.

3. Importance of Molarity Calculation

Details: Molarity is crucial in chemistry for preparing solutions with precise concentrations, performing stoichiometric calculations, and conducting experiments that require specific reagent concentrations.

4. Using the Calculator

Tips: Enter density in g/mL, percentage concentration (0-100%), 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 changes with temperature, molality doesn't.

Q2: Can I use this for any solute?
A: Yes, as long as you know the correct molecular weight and the solution's density and percentage concentration.

Q3: Why multiply by 1000 in the formula?
A: This converts g/mL to g/L (since there are 1000 mL in 1 L) to get proper molarity units (mol/L).

Q4: How accurate is this calculation?
A: It's mathematically precise, but accuracy depends on the precision of your input values (density, percentage, MW).

Q5: What if my percentage is PPM instead of %?
A: Convert PPM to percentage first (divide by 10,000) before using the calculator.