1. What is a Millimolar to PPM Calculator?

Definition: This calculator converts concentration from millimolar (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: The millimolar concentration is multiplied by the molecular weight to convert from moles to milligrams per liter.

3. Importance of Concentration Conversion

Details: Accurate conversion between units 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: What is the relationship between mM and PPM?
A: 1 mM equals the molecular weight in mg/L (PPM). For example, 1 mM NaCl (MW 58.44) = 58.44 PPM.

Q2: Why is molecular weight needed?
A: PPM is mass-based (mg/L) while mM is mole-based, so MW converts between moles and grams.

Q3: Can this be used for any solute?
A: Yes, as long as you know its molecular weight and it's dissolved in water or similar solvent.

Q4: How precise should the MW be?
A: Use at least 2 decimal places for accurate results in most applications.

Q5: Does temperature affect the conversion?
A: No, but temperature may affect the actual concentration if volume changes significantly.