1. What is a PPM to mmol/L Conversion Calculator?

Definition: This calculator converts concentration from parts per million (ppm) to millimoles per liter (mmol/L).

Purpose: It helps scientists, chemists, and medical professionals convert between these common concentration units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{mmol/L} \) — Concentration in millimoles per liter
• \( \text{PPM} \) — Concentration in parts per million
• \( \text{MW} \) — Molecular weight in grams per mole

Explanation: The ppm value is divided by the molecular weight to convert mass concentration to molar concentration.

3. Importance of Unit Conversion

Details: Accurate unit conversion is essential for chemical calculations, medical dosages, and scientific research where molar concentrations are more meaningful than mass concentrations.

4. Using the Calculator

Tips: Enter the concentration in ppm and the molecular weight of the substance in g/mol. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between ppm and mmol/L?
A: ppm is a mass-based concentration (1 mg per kg or L), while mmol/L is a molar concentration (number of millimoles per liter).

Q2: Where can I find molecular weights?
A: Molecular weights are available in chemical databases, periodic tables, or can be calculated by summing atomic weights.

Q3: Does temperature affect this conversion?
A: The conversion is temperature-independent for dilute aqueous solutions, but solution density changes with temperature may require adjustment.

Q4: Can I convert mmol/L back to ppm?
A: Yes, by reversing the formula: ppm = mmol/L × MW.

Q5: Is this valid for all substances?
A: Yes, as long as you use the correct molecular weight for the specific substance.