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Solution preparation

Molarity Calculator — Solve Mass, Concentration, or Volume

Enter molecular weight and three solution variables. Auto mode solves the one missing value; explicit modes deliberately ignore stale text in the selected output field.

Calculations run locally in your browser. Values are only placed in a URL when you choose “Copy Shareable Link.”

Solution inputs

Worked example

For NaCl at 58.44 g/mol, a 100 mM solution with a final volume of 100 mL requires 0.5844 g, or 584.4 mg.

How to use

  1. Choose Auto and leave exactly one solution field empty, or select the variable explicitly.
  2. Enter molecular weight and the remaining positive inputs.
  3. Choose the output unit, calculate, then copy the full audit-friendly summary.

Validation and limitations

The calculator rejects missing inputs, non-positive molecular weight, negative or zero required values, division by zero, and non-finite results. Confirm reagent identity, purity, hydrate state, and significant figures independently.

Calculation record

Methodology and scientific authority

Solve mass, amount concentration, or volume from molecular weight and the other two values.

Engine
solution-molarity 1.0.0
Content updated

Methodology

Normalizes mass, amount concentration, and volume to grams, moles per liter, and liters, then solves mass = molecular weight × concentration × volume.

Inputs

  • molecular weight
  • two of mass, concentration, and volume
  • display units

Outputs

  • solved quantity
  • normalized calculation
  • solution-preparation instruction

Validation examples

These scientific fixtures are reproducible tests of the calculation engine, not build-only checks.

  • 100 mM NaCl at 100 mL and 58.44 g/mol yields 584.4 mg. Test: nacl-mass

Assumptions and limitations

Assumptions

  • Molecular weight is supplied for the exact material being prepared.

Limitations

  • The calculation does not account for purity, density, hydrate state, displacement, or volume non-additivity.

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