A molarity to concentration calculator is a conversion tool designed to convert between molarity (M) and concentration using Concentration (g/L) = Molarity (mol/L) × Molecular Weight (g/mol) formula.
The calculator typically requires input values such as:
- Molecular weight of the solute
- Molarity of the solution
- Solution volume
Suppose you have a 2.5 M solution of sodium chloride (NaCl). Using the calculator with NaCl’s molecular weight (58.44 g/mol), you can quickly determine that the concentration is 146.1 g/L.
Molarity to Concentration Calculator
| Compound | Molarity (M) | Molecular Weight (g/mol) | Concentration (g/L) |
|---|---|---|---|
| NaCl | 2.0 | 58.44 | 116.88 |
| KOH | 1.5 | 56.11 | 84.17 |
| CaCl₂ | 0.5 | 110.98 | 55.49 |
| HCl | 3.0 | 36.46 | 109.38 |
| Na₂CO₃ | 1.0 | 105.99 | 105.99 |
| H₂SO₄ | 1.5 | 98.079 | 147.12 |
| C₆H₁₂O₆ (Glucose) | 0.75 | 180.156 | 135.12 |
| NH₄Cl | 2.0 | 53.49 | 106.98 |
| MgSO₄ | 1.0 | 120.37 | 120.37 |
| CH₃COOH (Acetic Acid) | 1.0 | 60.05 | 60.05 |
| NaHCO₃ | 1.5 | 84.01 | 126.02 |
| K₂SO₄ | 0.75 | 174.26 | 130.95 |
| BaCl₂ | 0.25 | 137.33 | 34.33 |
| C₁₂H₂₂O₁₁ (Sucrose) | 0.5 | 342.30 | 171.15 |
| LiOH | 2.0 | 23.95 | 47.90 |
Molarity to Concentration Conversion Formula
The formula for converting molarity to concentration is:
Concentration (g/L) = Molarity (mol/L) × Molecular Weight (g/mol)Let’s convert 1.5 M H₂SO₄ to g/L:
- Molecular weight of H₂SO₄ = 98.079 g/mol
- Molarity = 1.5 mol/L
- Concentration = 1.5 mol/L × 98.079 g/mol
- Concentration = 147.12 g/L
How to Convert Molarity to Concentration?
Converting molarity to concentration involves a systematic approach:
- Identify the Molecular Weight: Look up the molecular weight of your compound.
- Verify the Molarity: Confirm the molarity value.
- Apply the Conversion Formula: Multiply molarity by molecular weight.
Converting 0.75 M glucose (C₆H₁₂O₆) to g/L:
Molecular weight of glucose = 180.156 g/mol
Given molarity = 0.75 mol/L
Concentration = 0.75 mol/L × 180.156 g/mol
Final concentration = 135.12 g/L
Is Molarity the Same as Concentration?
While related, molarity and concentration are distinct concepts in chemistry:
- Molarity specifically refers to the number of moles of solute per liter of solution (mol/L), while concentration can be expressed in various units (g/L, mg/mL, ppm, etc.).
Key Differences Include:
- Molarity is temperature-dependent due to volume changes.
- Mass concentration remains constant regardless of temperature.
- Molarity directly relates to chemical reactions.
- Concentration is more practical for solution preparation.
Consider a 1 M NaOH solution:
- Molarity = 1 mol/L
- Molecular weight = 40 g/mol
- Mass concentration = 40 g/L
References
- American Chemical Society – Chemical Education Resources https://www.acs.org/education/resources.html
- Royal Society of Chemistry – Education Resources https://edu.rsc.org/resources
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