1. What is Molarity Calculation?

The molarity calculation converts percentage concentration to molar concentration (mol/L) using the solution's density and the solute's molecular weight. This is particularly useful when working with chemical solutions from suppliers like Sigma Aldrich.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( \% \) — Percentage concentration (%)
• \( d \) — Density (g/mL)
• \( MW \) — Molecular weight (g/mol)

Explanation: The equation converts mass percentage to molarity by accounting for the solution's density and the solute's molecular weight.

3. Importance of Molarity Calculation

Details: Accurate molarity calculation is essential for preparing solutions with precise concentrations, especially in chemical and biological experiments.

4. Using the Calculator

Tips: Enter percentage concentration (%), density (g/mL), and molecular weight (g/mol). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why multiply by 10 in the formula?
A: The factor of 10 converts from percentage (per 100) to decimal (per 1) and adjusts units from g/mL to g/L.

Q2: Where can I find density values?
A: Density values are typically provided on chemical solution labels or in supplier catalogs like Sigma Aldrich.

Q3: What if my solution is very dilute?
A: For very dilute solutions, the density approaches that of the solvent (e.g., ~1 g/mL for aqueous solutions).

Q4: Does temperature affect the calculation?
A: Yes, density changes with temperature. Use density values measured at the same temperature as your experiment.

Q5: Can I use this for mixed solvents?
A: This calculation assumes the density is for the complete solution. For mixed solvents, ensure you have the correct density.