PPM to Molarity Calculator

Convert a ppm concentration to molarity.

Molarity (mol/L) 0.0017

Formula: M = ppm ÷ (1000 × molar mass)

Step-by-step with your numbers:

1. Values used:

2. Concentration = 100 ppm (mg/L)

3. Molar mass = 58.44 g/mol

5. Molarity = 0.0017mol/L

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Convert a dilute concentration in ppm (mg/L) to molarity.

The math behind it

molarity = ppm ÷ (1000 × molar mass). ppm in water ≈ mg/L.

100 ppm NaCl (58.44) → 0.00171 M.

ppm = mg/L?

For dilute aqueous solutions, yes (water density ≈ 1).