Handitab

Solution Calculator

Calculate how to dilute a stock solution with C1V1 = C2V2 and how many grams of solute to weigh for a target molarity and volume.

About Solution Calculator

This calculator covers the two most common solution preparations. For a dilution it uses C1V1 = C2V2: the stock volume needed is V1 = C2 × V2 ÷ C1, and the rest of the final volume is solvent. For a solution made from a solid it uses mass = molarity × volume in litres × molar mass. The default example weighs sodium chloride (58.44 g/mol) for 500 mL of a 0.15 mol/L solution, which takes 4.383 g.

How to use Solution Calculator

  1. Fill in "Stock concentration", "Final concentration", "Final volume" and "Molar mass of solute", and the other options.
  2. The result appears below and updates as you type.
  3. Copy the result with the copy button, or download it as a file where that is offered.

Questions about Solution Calculator

Do C1 and C2 need particular units?

No, as long as both use the same unit, such as mol/L, percent, or mg/mL. The units cancel in C1V1 = C2V2. The stock volume comes out in the same unit as the final volume, here millilitres.

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