1. What is a PPM to Molarity Calculator?

Definition: This calculator converts concentration from parts per million (ppm) to molarity (mol/L).

Purpose: It helps chemists, biologists, and environmental scientists convert between these common concentration units.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( M \) — Molarity (moles per liter)
• \( PPM \) — Parts per million (mg solute per kg solution)
• \( MW \) — Molecular weight (grams per mole)

Explanation: PPM is converted to mg/L (assuming water density of 1 kg/L), then divided by molecular weight to get moles per liter.

3. Importance of PPM to Molarity Conversion

Details: Molarity is essential for chemical reactions and solution preparation, while PPM is commonly used in environmental measurements.

4. Using the Calculator

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

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between PPM and molarity?
A: PPM is a mass ratio (1 part per million), while molarity measures moles of solute per liter of solution.

Q2: Why divide by 1000 in the formula?
A: This converts mg (from PPM) to grams to match the molecular weight units (g/mol).

Q3: Does this work for all solutes?
A: Yes, as long as you know the molecular weight. For mixtures, use average molecular weight.

Q4: What if my solution isn't water?
A: The calculation assumes water density (1 kg/L). For other solvents, additional density correction is needed.

Q5: How precise is this conversion?
A: Very precise for dilute aqueous solutions. For concentrated solutions, activity coefficients should be considered.