PPM Dilution Calculator
The PPM Dilution Calculator uses C1V1 = C2V2 to solve a dilution problem when a stock concentration is diluted to a target concentration.
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What is the PPM Dilution Calculator?
It helps plan stock-solution dilutions by solving for the missing concentration or volume while keeping the amount of solute constant.
C1 × V1 = C2 × V2. The equation represents conservation of solute during an ideal dilution where solvent is added and the final mixture is homogeneous.
How to use this calculator
- Identify the stock concentration C1.
- Identify the stock volume V1 if known.
- Enter the target concentration C2 or final volume V2.
- Choose the variable to solve.
- Check that concentration and volume units are consistent.
Worked example
Where this calculation is useful
The PPM Dilution Calculator can be useful for students, laboratory users, environmental professionals, engineers, and anyone working with trace concentrations when the concentration basis matches the method described above.
- Laboratory solution preparation
- Water-treatment dosing plans
- Calibration standards
- Serial and stepwise dilution planning
Common mistakes to avoid
- Using solvent volume instead of final volume
- Mixing concentration units
- Forgetting that dilution cannot increase concentration
- Ignoring stock purity or assay corrections
Assumptions
Solute mass remains constant during solvent addition.
Limitations
Assumes ideal mixing without non-additive volume contraction.
Formula explained
Conservation of mass principle applied to solute in dilution steps.
C1 × V1 = C2 × V2. The equation represents conservation of solute during an ideal dilution where solvent is added and the final mixture is homogeneous.
PPM Dilution Calculator FAQs
What is the formula for PPM dilution?
The standard ideal-dilution relationship is C1V1 = C2V2.
How do I calculate the volume of stock needed?
Rearrange the equation to V1 = (C2 × V2) ÷ C1.
How do you dilute 1,000 PPM to 100 PPM?
A tenfold dilution is required. For example, 10 mL of 1,000 PPM stock brought to a final volume of 100 mL gives 100 PPM.
Does dilution change the amount of solute?
In an ideal dilution, the amount of solute is conserved while the total volume increases.
Can dilution increase PPM?
No. Adding solvent lowers concentration. Increasing concentration requires removing solvent or adding solute under the relevant process conditions.
What is the difference between dilution factor and concentration?
The dilution factor describes how much the original concentration is reduced; concentration is the resulting amount of solute per stated basis.
Related calculators
Use these tools when you need the reverse conversion, a neighboring concentration unit, or the next step in a dilution or chemistry workflow.
Need another PPM calculation?
Calculator inputs are used only to produce the result. Do not enter confidential laboratory or client information.
Open the main PPM Calculator →