Molarity to PPM Calculator
Molarity to PPM calculator
Convert molarity to ppm using molar mass.
InputsChemistry2 fieldsLive
Result
5,844 ppm
Uses ppm ≈ M × molar mass × 1000 for dilute aqueous solutions.
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Formula
ppm = M x Mr x 1000 Symbol legend
| Symbol | Meaning | Unit | Copy |
|---|---|---|---|
M | Molarity | mol/L | |
M_r | Molar mass | g/mol | |
ppm | Parts per million (approx mg/L) | mg/L |
- Start with molarity in mol/L.
- Multiply by molar mass to get g/L.
- Multiply by 1000 to convert g/L to mg/L (approx ppm).
Example
Worked example: 0.10 M NaCl
- 1 M = 0.10 mol/L
- 2 Mr = 58.44 g/mol
- 3 ppm = 0.10 x 58.44 x 1000 = 5844
The concentration is 5844 ppm.
How
- Enter molarity value in mol/L.
- Enter molar mass in g/mol.
- Read converted concentration in ppm.
Avoid
- Forgetting the 1000 factor when moving from g/L to mg/L.
- Using the wrong compound molar mass.
- Assuming ppm conversion is exact outside dilute aqueous conditions.
Ref only. Verify values. Follow lab safety.
FAQ
Is this ppm output equivalent to mg/L?
For dilute aqueous solutions, ppm is commonly treated as approximately mg/L.
Can I use this for gases?
Gas ppm conversions require different assumptions and should be handled separately.
Why do I need molar mass?
Molar mass links molar concentration to mass concentration.
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