LabCalc

Solution Preparation Calculator

n = c × V, m = n × M

Calculate the mass of solid needed to prepare a solution at a target molar concentration and final volume.

Inputs

g/mol

Result

0.5844 g

Weigh out this mass and dissolve to a final volume of 100 mL.

Sign in to save

Calculation

  1. Amount of substance

    n = c × V

    n = 0.1 mol/L × 0.1 L

    n = 0.01 mol

  2. Required mass

    m = n × M

    m = 0.01 mol × 58.44 g/mol

    m = 0.5844 g

Inputs

Molecular weight
58.44 g/mol
Target concentration
0.1 mol/L
Final volume
100 mL

Dissolve the solid in less than the final volume, then make up to the final volume.

kg g mg µg ng L mL µL nL mol/L mmol/L µmol/L nmol/L

About this calculator

To prepare a solution of a known molar concentration, first calculate the amount of substance required from the concentration and the final volume (n = c × V), then convert that amount into a mass using the molecular weight (m = n × M).

Values are converted to mol/L and litres internally, so any combination of the supported units gives the same answer. Dissolve the weighed solid in a smaller volume of solvent first and then make up to the final volume — the volume of the dissolved solid is included in the final volume.

Example: 100 mL of a 0.100 mol/L NaCl solution (M = 58.44 g/mol) requires 0.5844 g NaCl.

LabCalc is provided as a calculation aid. Users remain responsible for verifying calculations, units, chemical compatibility, experimental procedures and applicable safety requirements before laboratory use.

Related calculators

Dilution

C1 × V1 = C2 × V2

Solve C1 × V1 = C2 × V2 for any missing variable.

Open

Molarity

n = m / M, c = n / V

Relate mass, amount of substance, molecular weight, volume and concentration.

Open

Molecular weight

M = Σ (nᵢ × Aᵢ)

Formula mass from a chemical formula, with an element breakdown.

Open

Percentage solutions

% = (solute / total) × 100

% w/v, % v/v and % w/w in both directions.

Open