Calculadora de Molaridade
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
M = n / V
About this calculator
The molarity calculator is a practical tool for determining the molar concentration of a solution using the formula M = n / V, where M is molarity (mol/L), n is the number of moles of solute, and V is the volume of the solution in liters. It is essential for laboratories, chemistry classes, and industries that need to prepare solutions with exact concentration.
To use the calculator, enter the amount of solute in moles and the volume of the solution in liters. The result is the molarity in mol/L. If you have the mass of the solute, you can calculate moles by dividing the mass by the molar mass of the substance. The tool also allows unit conversion, such as milliliters to liters, ensuring accuracy in calculations.
Molarity is widely used in stoichiometry to predict chemical reactions, in titration analysis, and in preparing standard solutions. For example, when diluting a concentrated acid, the calculator helps determine the volume needed to achieve a desired concentration. Remember that temperature can affect volume, so use controlled conditions.
Common precautions include checking units (volume always in liters) and ensuring the solute is completely dissolved. Additionally, molarity is not suitable for very dilute solutions, where concentration in ppm or molality may be more appropriate. Always use precise molar mass data and avoid premature rounding.
Frequently asked questions
How do I calculate molarity if I have the mass of the solute?
First, convert mass to moles by dividing by the molar mass of the substance. Then enter that value along with the volume in liters into the calculator.
Can I use milliliters instead of liters?
Yes, but the calculator expects volume in liters. Convert milliliters by dividing by 1000 before entering.
Does temperature affect the molarity calculation?
Yes, because liquid volume changes with temperature. For best accuracy, measure volume at the working temperature.
What is the difference between molarity and molality?
Molarity is moles per liter of solution, while molality is moles per kilogram of solvent. Molarity depends on volume, which is temperature-sensitive; molality does not.
What if the solute does not dissolve completely?
The calculated molarity assumes complete dissolution. If undissolved solid remains, the actual concentration is lower. Stir or heat the solution until fully dissolved.