Molarity Calculator
Calculate molarity, mass, or volume for chemical solutions. Ideal for laboratory preparation and chemistry students.
Molarity Equation
Molarity (M) is defined as the number of moles of solute per liter of solution. It is the most common unit of concentration in chemistry.
- Molarity (M): Concentration in mol/L.
- Mass (m): Weight of the solute in grams (g).
- Volume (V): Total volume of the solution in liters (L).
- Molecular Weight (MW): The mass of one mole of a substance (g/mol).
Preparing Solutions
To prepare a solution of a specific molarity:
- Calculate the required Mass using the formula:
mass = M × V × MW. - Weigh out the exact amount of solute.
- Dissolve the solute in a small amount of solvent (e.g., distilled water).
- Add solvent until the total volume reaches the target Volume.
? Frequently Asked Questions
Molarity (M) is moles per liter of solution (volume), while Molality (m) is moles per kilogram of solvent (mass). Molarity changes with temperature (as volume expands/contracts), while Molality does not.
You can find the Molecular Weight (or Molar Mass) by summing the atomic masses of all atoms in the chemical formula. Use our Molecular Weight Calculator for quick results.
1 mM (millimolar) is one thousandth of a Molar (10⁻³ M). It is equal to 1 mmol/L.