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Molarity (M)
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Result
Enter values and click Calculate.
Example Data
| # | Timestamp | Type | Inputs | Result |
|---|---|---|---|---|
| 1 | 2025-08-29 10:00 | Molarity (M) | n = 0.25 mol, V = 0.50 L | 0.500 M |
| 2 | 2025-08-29 10:02 | Mass percent | solute = 5 g, solution = 200 g | 2.50 % w/w |
| 3 | 2025-08-29 10:05 | PPM | solute = 12 mg, solution = 3 kg | 4.00 ppm |
Formulas Used
- Molarity (M): \( M = \dfrac{n}{V} \) where n in mol and V in L.
- Molality (m): \( m = \dfrac{n}{m_s} \) where m_s is mass of solvent in kg.
- Mass percent: \( \%\,w/w = \dfrac{m_{\text{solute}}}{m_{\text{solution}}} \times 100 \).
- Volume percent: \( \%\,v/v = \dfrac{V_{\text{solute}}}{V_{\text{solution}}} \times 100 \).
- Mole fraction: \( \chi_A = \dfrac{n_A}{n_A + n_B} \).
- PPM: \( \text{ppm} = \dfrac{\text{mass solute}}{\text{mass solution}} \times 10^6 \). For mg/kg this equals the numeric ppm value.
All unit selections above are automatically normalized before computation.
How to Use This Calculator
- Choose the concentration mode from the dropdown.
- Enter required values and pick appropriate units.
- Click Calculate to see the result and full workings.
- Click Add to Table to append the current result to the dataset.
- Use Download CSV or Download PDF to export the table.
- Use Reset to clear inputs for a fresh run.
FAQs
Molarity uses solution volume in liters while molality uses mass of solvent in kilograms. Molarity varies with temperature due to thermal expansion whereas molality does not.
Use mass percent for solid or mixed systems where masses are convenient. Use volume percent for liquid mixtures where volumes are additive and easy to measure.
ppm is a ratio that can apply to mass or volume bases as long as consistent units are used. For water at low concentrations mg per L numerically equals ppm.
This tool focuses on a solute solvent pair. For multicomponent mixtures compute χ for one component using its moles divided by the total moles of all components.
The calculator converts units internally to the required base units before computing. Accuracy depends on your measurement precision and significant figures in inputs.
Yes. Add each calculation to the table then export as CSV or PDF using the buttons above to include in lab records or coursework.