Convert ppb to mol/L (molarity) using a substance’s molar mass, or mol/L to ppb, for water solutions or gases in ppbv, with US EPA limit checks.
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PPB to mol/L Formula
The following formula is used to calculate the molarity (mol/L) from the concentration in ppb and the molar mass.
Variables:
- M is the molarity (mol/L)
- C is the concentration in ppb
- Mm is the molar mass (g/mol)
To calculate the molarity, multiply the concentration in ppb by 10-9 and then divide by the molar mass.
| Concentration (ppb) | Molar Mass (g/mol) | Molarity (mol/L) |
|---|---|---|
| 1 | 20 | 0.000000050 |
| 1 | 50 | 0.000000020 |
| 1 | 100 | 0.000000010 |
| 1 | 200 | 0.000000005 |
| 5 | 20 | 0.000000250 |
| 5 | 50 | 0.000000100 |
| 5 | 100 | 0.000000050 |
| 5 | 200 | 0.000000025 |
| 10 | 20 | 0.000000500 |
| 10 | 50 | 0.000000200 |
| 10 | 100 | 0.000000100 |
| 10 | 200 | 0.000000050 |
| 50 | 20 | 0.000002500 |
| 50 | 50 | 0.000001000 |
| 50 | 100 | 0.000000500 |
| 50 | 200 | 0.000000250 |
| 100 | 20 | 0.000005000 |
| 100 | 50 | 0.000002000 |
| 100 | 100 | 0.000001000 |
| 100 | 200 | 0.000000500 |
| * Rounded to 9 decimals. Formula: M (mol/L) = (ppb × 10⁻⁶ g/L) ÷ (molar mass in g/mol). Assumes water-like density (1 ppb ≈ 1 µg/L). | ||
What is PPB to mol/L Conversion?
PPB (parts per billion) to mol/L (molarity) conversion is a method used to express the concentration of a solution. PPB is a unit of measurement that describes the amount of a substance in a billion parts of the solution. Molarity, on the other hand, is a measure of the concentration of a solute in a solution, expressed as the number of moles of solute per liter of solution. This conversion is essential in chemistry for preparing solutions with precise concentrations.
How to Calculate PPB to mol/L?
The following steps outline how to calculate the conversion from PPB to mol/L.
- First, determine the concentration in ppb (C).
- Next, determine the molar mass of the substance (Mm).
- Next, calculate the molarity using the formula M = (C * 10-9) / Mm.
- Finally, calculate the molarity.
- After inserting the values and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Concentration in ppb (C) = 500
Molar Mass (Mm) = 18 g/mol
