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Solution Preparation Calculator

Calculate required amounts of solute and solvent for preparing solutions of specific concentrations. Supports molarity, molality, mass percentage, and PPM.

Enter the chemical formula of the solute

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Frequently Asked Questions

Enter the chemical formula of the solute (e.g., NaCl), select the concentration type (molarity, molality, mass percentage, or PPM), input the target concentration value and solution volume, then click calculate to get the required solute mass.

Four common concentration types are supported: molarity (mol/L), molality (mol/kg), mass percentage (%), and PPM (parts per million). The system automatically converts and displays corresponding values in other concentration units.

Calculations are based on accurate molecular weight databases and standard chemical formulas with high precision. Density values are approximate estimates; adjustments based on specific conditions are recommended for actual preparation.

Currently supports single-solute solution preparation calculations. For mixed solutions, it's recommended to calculate each component separately and then mix proportionally.

The system automatically provides conversion results for multiple concentration units. When you input any concentration type, you'll get corresponding values in other units, making it convenient for laboratory use.

Applications

Laboratory Applications

  • Analytical chemistry standard solution preparation
  • Buffer and reagent solution preparation
  • Sample pretreatment solution preparation

Educational Applications

  • Chemistry lab course solution preparation
  • Concentration calculation principles teaching
  • Quantitative analysis experiment guidance

Method, source and limitations

Method version: solution-basis-2.0
Calculation method
Amount-of-substance and concentration equations with an explicit basis for each concentration type.
Data source
Definitions of molarity, molality, mass fraction, and ppm.
Assumptions and limitations
Density, volume contraction, purity, and cross-concentrations are not guessed.
Verification example
For molarity, the basis is final solution volume; for molality, it is solvent mass.

Verified Calculator · Last validated: 2026-07-28

Result guidance

How does this tool calculate the result?

Amount-of-substance and concentration equations with an explicit basis for each concentration type.

How should I interpret the result?

Density, volume contraction, purity, and cross-concentrations are not guessed.

How can I verify the result?

For molarity, the basis is final solution volume; for molality, it is solvent mass.