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Solution & Concentration Calculators

Solution Preparation Calculator

How much solid to weigh out, or stock to pipette, to make a solution of a given strength and volume.

Enter values

Results update as you type.

Result

Solid to weigh out

2.0201 g

Dissolve in about two thirds of the final volume, then make up to the mark.

In milligrams
2,020.1
Moles of solute
0.05 mol
Molar mass
39.997 g/mol
Pure compound needed
1.9999 g
Step-by-stepShow
  1. n = 0.1 mol/L × 0.5 L = 0.05 mol
  2. m = 0.05 × 39.997 = 1.9999 g
  3. Adjusted for 99% purity → 2.0201 g

About the Solution Preparation Calculator

How much solid to weigh out, or stock to pipette, to make a solution of a given strength and volume.

Also known as: how to make a solution, prepare molar solution, weigh out solute, lab solution calculator.

How to use this calculator

  1. Enter solute formula, target concentration, volume to prepare, reagent purity and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Open “Step-by-step” to see how the answer was worked out.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

mass = molarity × volume (L) × molar mass ÷ purity

Worked example

Using the values pre-filled in the calculator above:

  • Solute formula: NaOH
  • Target concentration = 0.1 mol/L
  • Volume to prepare = 500 mL
  • Reagent purity = 99 %
  • Stock concentration (0 for solid) = 0 mol/L

the calculator returns:

  • Solid to weigh out: 2.0201 g
  • In milligrams: 2,020.1
  • Moles of solute: 0.05 mol
  • Molar mass: 39.997 g/mol

Working

  1. n = 0.1 mol/L × 0.5 L = 0.05 mol
  2. m = 0.05 × 39.997 = 1.9999 g
  3. Adjusted for 99% purity → 2.0201 g