1. What is a mm to ppm Calculator?

Definition: This calculator converts millimolar concentration (mM) to parts per million (ppm) using molecular weight.

Purpose: It helps chemists, biologists, and researchers convert between these common concentration units in solution chemistry.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{PPM} \) — Concentration in parts per million (mg/L)
• \( \text{mM} \) — Millimolar concentration (mmol/L)
• \( \text{MW} \) — Molecular weight (g/mol)

Explanation: Since 1 mM = 1 mmol/L and 1 mmol = MW mg, multiplying mM by MW converts to mg/L (which is equivalent to ppm for dilute aqueous solutions).

3. Importance of Concentration Conversion

Details: Accurate unit conversion is essential for preparing solutions, comparing studies, and following protocols that use different concentration units.

4. Using the Calculator

Tips: Enter the millimolar concentration and molecular weight of the solute. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: When is this conversion valid?
A: This conversion is exact for dilute aqueous solutions where the density is approximately 1 kg/L.

Q2: How do I find molecular weight?
A: Sum atomic weights from the periodic table or look up the compound's molecular weight.

Q3: What's the difference between ppm and mM?
A: mM is molarity (moles per liter), while ppm is mass per volume (mg per liter) of solution.

Q4: Can I use this for non-aqueous solutions?
A: Only if you account for the solution density, as ppm is mass-based while mM is mole-based.

Q5: How precise is this conversion?
A: It's mathematically exact, but practical accuracy depends on your input values' precision.