What is the Solution Concentration Calculator?
Preparing a solution in the lab means knowing how much solute to weigh and what concentration you will get — or diluting a stock bottle to a working concentration. This calculator covers the core relationships: molarity M = n/V, mass-based molarity from formula and volume, mass required for a target molarity, and the dilution equation C₁V₁ = C₂V₂. Enter a chemical formula to look up molar mass automatically, or type molar mass directly. Volumes can be in liters or milliliters. Everything runs instantly in your browser with no signup.
How to use the Solution Concentration Calculator
- Choose a mode: molarity from moles, molarity from mass, mass for a target molarity, or dilution.
- For mass-based modes, enter the solute formula (e.g. NaCl) or a molar mass override.
- Enter the known values — moles, mass, volume, or dilution concentrations/volumes.
- Read molarity (mol/L), mass concentration (g/L) when applicable, and dilution results.
- Copy the summary for your lab notebook.
Common use cases
- Finding molarity after dissolving a known mass of NaCl in water
- Calculating how many grams to weigh for 0.5 M solution in 500 mL
- Diluting 1 M stock to 0.25 M and finding the final volume
Frequently asked questions
- What is molarity?
- Molarity (M) is moles of solute per liter of solution: M = n / V. Units are mol/L.
- How does the dilution calculator work?
- It uses C₁V₁ = C₂V₂. Enter three known values and choose which variable to solve (stock or final concentration or volume).
- Can I use milliliters for volume?
- Yes. Select mL as the volume unit; calculations are converted to liters internally.
