1. What is Molarity?

Molarity (M) is a unit of concentration representing the number of moles of a solute per liter of solution. It's one of the most commonly used units in chemistry for quantifying solution concentrations.

2. How Does the Calculator Work?

The calculator uses the molarity formula:

Where:

• \( M \) — Molarity (mol/L)
• \( C \) — Concentration in ng/mL
• \( MW \) — Molecular weight in g/mol

Explanation: The formula converts mass concentration (ng/mL) to molar concentration (mol/L) by dividing by the molecular weight and adjusting the units (1 g = 10^9 ng and 1 L = 1000 mL).

3. Importance of Molarity Calculation

Details: Molarity is essential for preparing solutions with precise concentrations, performing chemical reactions, and comparing concentrations of different substances. Many biological and chemical experiments require specific molar concentrations.

4. Using the Calculator

Tips: Enter the concentration in ng/mL and the molecular weight in g/mol. Both values must be positive numbers. The result will be displayed in mol/L (Molar) with both decimal and scientific notation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the conversion factor 10^-6?
A: This accounts for unit conversions: 1 ng = 10^-9 g and 1 mL = 10^-3 L, so (10^-9)/(10^-3) = 10^-6.

Q2: What if my substance is a dimer or multimer?
A: Use the molecular weight of the complete multimeric form. For example, for a dimer, use twice the monomer molecular weight.

Q3: How precise is this calculation?
A: The calculation is mathematically exact. Precision depends on the accuracy of your input values.

Q4: Can I use this for mixtures?
A: No, this calculates molarity for a single substance. For mixtures, you'd need to calculate each component separately.

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 significantly for concentrated solutions.