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Molarity measures how concentrated a solution is, in moles of solute per liter of solution.
This calculator finds the molarity of a solution from the mass of solute dissolved, its molar mass, and the total solution volume.
How it works
Enter the mass of solute in grams, its molar mass in g/mol, and the volume of the solution in liters. The calculator first finds the number of moles \(n = m/M\), then divides by volume to get molarity \(M = n/V\).
- Enter mass of solute (g).
- Enter molar mass (g/mol).
- Enter volume of solution (L).
- Click Calculate to see your results.
Examples
58.44 g of table salt in 1 L
Dissolving 58.44 g of sodium chloride (molar mass 58.44 g/mol) in enough water to make 1 L of solution produces exactly a 1 mol/L (1 M) solution.
Who should use it
- Preparing a solution of known concentration for a chemistry lab.
- Checking coursework involving molarity, moles, and solution concentration.
Industry applications
- Chemistry education and laboratory work
- Pharmaceutical and industrial chemical formulation
Advantages
- Computes both moles and molarity in a single calculation.
- Works for any solute and solvent combination.
Limitations
- Doesn't account for volume changes on mixing (relevant for very concentrated solutions).
Common mistakes to avoid
- Using the volume of solvent added instead of the final total solution volume.
- Entering the molecular formula's weight in the wrong units (this calculator expects g/mol, not kg/mol).
Best practices
- When preparing a solution in the lab, use a volumetric flask so the final volume is precisely known.
Tips
- Pair this with the Molecular Weight Calculator to go straight from a chemical formula to a target molarity without looking up molar masses manually.