Convert solution concentration

Compare molarity, molality, and mass percentage from solute, solvent, and solution properties.

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ToolSolution Concentration Converter
Input
Output
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How it works

Solute mass divided by molar mass gives moles; total solution mass divided by supplied density gives volume; molarity divides moles by litres. Mass percentage uses solute over total solution mass, while molality uses solvent kilograms.

  • Density is an explicit input.
  • The conventions are reported separately.

Worked example

A salt solution
5.844g of NaCl in 94.156g of water, solution density 1.03 g/mL
Input
											Solute mass g: 5.844
Solvent mass g: 94.156
Molar mass gmol: 58.44
Solution density gml: 1.03
Output
												Molarity mol per l: 1.03
Molality mol per kg: 1.0621
Percent by mass: 5.844
Ppm: 58440

When to use this

Formulations convert mass fraction, laboratory worksheets compare concentration conventions, and quality control checks percentage by mass.

Edge cases

  • Solvent density is not final-solution density.
  • Molality uses solvent mass while mass percentage uses total solution mass.
  • Density units must match grams and litres.