1. What is Millimolar Concentration?

Millimolar (mM) concentration represents the number of millimoles of a solute per liter of solution. It is a commonly used unit in chemistry and biochemistry for expressing solution concentrations.

2. How Does the Calculator Work?

The calculator uses the millimolar calculation formula:

Where:

• \( mM \) — Millimolar concentration (mmol/L)
• \( mg/L \) — Mass concentration in milligrams per liter
• \( MW \) — Molecular weight in grams per mole (g/mol)
• \( 1000 \) — Conversion factor (1000 mmol/mol)

Explanation: This formula converts mass concentration to molar concentration by dividing by molecular weight and converting moles to millimoles.

3. Importance of Millimolar Calculation

Details: Accurate millimolar calculations are essential for preparing chemical solutions, conducting experiments, pharmaceutical formulations, and ensuring proper concentrations in biological assays.

4. Using the Calculator

Tips: Enter mass concentration in mg/L and molecular weight in g/mol. Both values must be positive numbers. The calculator will provide the millimolar concentration.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between molar and millimolar?
A: Molar (M) is moles per liter, while millimolar (mM) is millimoles per liter (1 M = 1000 mM).

Q2: Why multiply by 1000 in the formula?
A: The factor 1000 converts moles to millimoles (1 mole = 1000 millimoles).

Q3: Can I use different mass concentration units?
A: Yes, but you must convert to mg/L first. For example, μg/mL = mg/L, so no conversion needed.

Q4: What if I have concentration in g/L?
A: Convert g/L to mg/L by multiplying by 1000, then use the formula.

Q5: Is molecular weight always needed?
A: Yes, molecular weight is essential for converting between mass and molar concentrations.