Dilution Calculator
Use C1V1 = C2V2 to solve for any unknown in a dilution problem.
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Enter any three of the four values: initial concentration (C1), initial volume (V1), final concentration (C2), and final volume (V2). Leave the unknown field empty. The calculator uses C1V1 = C2V2 to solve for the missing value instantly.
About the Dilution Calculator
The dilution equation C1V1 = C2V2 is one of the most frequently used formulas in chemistry labs. It works because adding solvent does not change the total moles of solute present. This calculator handles all four solve-for scenarios, making it useful for preparing stock solutions, serial dilutions, and lab protocols.
Frequently Asked Questions
What does C1V1 = C2V2 mean?
This equation states that the amount of solute stays constant during dilution. C1 and V1 are the initial concentration and volume. C2 and V2 are the final concentration and volume. Since you are only adding solvent, the total moles of solute remain the same.
Which value should I leave blank?
Leave blank whichever value you want to solve for. The calculator needs exactly 3 of the 4 values to compute the missing one. Most commonly, you know C1, C2, and V2, and need to find V1.
Can I use different volume units?
Yes, as long as both volumes use the same unit (both mL, both L, etc.), the equation works. The units cancel out on both sides, so consistency is all that matters.