PPM to Molarity Calculator
PPM to molarity calculator
Convert ppm concentration to molarity using molar mass.
InputsChemistry2 fieldsLive
Result
0.1 M
Assumes dilute aqueous ppm ≈ mg/L.
Live update
Chem signal
Advanced options
Formula
M = ppm / (1000 x Mr) Symbol legend
| Symbol | Meaning | Unit | Copy |
|---|---|---|---|
M | Molarity | mol/L | |
ppm | Parts per million (approx mg/L in dilute aqueous systems) | mg/L | |
M_r | Molar mass | g/mol |
- Use ppm value as approximate mg/L in dilute aqueous conditions.
- Divide by molar mass and 1000 conversion factor.
- Result is molarity in mol/L.
Example
Worked example: 5844 ppm NaCl
- 1 ppm = 5844
- 2 Mr = 58.44 g/mol
- 3 M = 5844 / (1000 x 58.44) = 0.10
The molarity is 0.10 M.
How
- Enter concentration in ppm.
- Enter molar mass in g/mol.
- Read converted molarity value.
Avoid
- Applying this conversion to concentrated or non-aqueous systems without correction.
- Using incorrect molar mass.
- Forgetting ppm here assumes approximate mg/L.
Ref only. Verify values. Follow lab safety.
FAQ
Is ppm always equal to mg/L?
It is a common approximation for dilute aqueous solutions near density 1 g/mL.
Do I still need molar mass?
Yes, molar mass is required to convert mass concentration into molar concentration.
Can this output scientific notation?
Yes, very small molarity values are formatted clearly in decimal or scientific style.
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