1. What is Millimolar Concentration?

Millimolar concentration (mM) represents the number of millimoles of a solute per liter of solution. It's a common unit in chemistry and biology for expressing solution concentrations.

2. How Does the Calculator Work?

The calculator uses the millimolar concentration formula:

Where:

• \( g \) — Mass of solute in grams
• \( MW \) — Molecular weight of solute in g/mol
• \( V \) — Volume of solution in liters
• 1000 — Conversion factor from moles to millimoles

Explanation: The formula converts mass to moles, divides by volume to get molarity, then converts to millimolarity.

3. Importance of Millimolar Concentration

Details: Millimolar concentration is crucial for preparing solutions with precise concentrations, especially in biochemical experiments, medical formulations, and chemical reactions.

4. Using the Calculator

Tips: Enter mass in grams, molecular weight in g/mol, and volume in liters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between molar and millimolar?
A: 1 molar (M) = 1000 millimolar (mM). Millimolar is more convenient for many biological concentrations.

Q2: How do I find molecular weight?
A: Sum atomic weights of all atoms in the molecule. For common compounds, look up values in chemical databases.

Q3: Can I use milliliters instead of liters?
A: Yes, but you must convert to liters (divide mL by 1000) before using in the formula.

Q4: Why is millimolar concentration important in biology?
A: Many biological processes occur at millimolar concentrations (enzyme kinetics, ion concentrations, etc.).

Q5: How precise should my measurements be?
A: Use analytical balance for mass (4 decimal places) and volumetric glassware for most accurate results.