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Chemistry

Solution Dilution Calculator

Calculate the stock volume needed to prepare a target concentration and final volume using C1V1 = C2V2.

Explicit units and model assumptionsLocal calculations with worked examples
Chemistry workspace
Chemistry workspace

Check the units, concentration basis and assumptions before interpreting the result.

See the method

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Your chemistry result

Your result

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Use the Calculate button to see your result.

Review the method below for assumptions and conventions.

How to use this tool

  1. Enter stock concentration, target concentration, final solution volume.
  2. Select Calculate to view the result.
  3. Check the method and assumptions below before using the result.

The method, explained

Stock volume = target concentration × final volume ÷ stock concentration. Diluent estimate = final volume − stock volume. Prepare to the final volume rather than assuming perfectly additive volumes.

A WORKED EXAMPLE

Using stock concentration = 2 mol/L, target concentration = 0.1 mol/L, final solution volume = 100 mL, the result is 5 mL stock. Change these example inputs to match your task; use the method above to check each step.

Understanding your result

The diluent amount is a volume-difference estimate. Real mixtures may change volume: use a suitable procedure to make the solution up to the stated final volume.

What to keep in mind

Assumes the solute amount is conserved. This is not a chemical-mixing safety guide. Educational calculation only; use validated procedures for laboratory work.

Reference: OpenStax Chemistry 2e — chemical quantities and models

Common questions

Do I add the calculated amount of water exactly?

The diluent amount is a volume-difference estimate. Real mixtures may change volume: use a suitable procedure to make the solution up to the stated final volume.

Are my inputs uploaded?

No. This calculation runs in your browser without an account or an external API.

Methodology maintained by ClarityKit. How these tools are built and checked.