Concentration & Dilution Calculator

Your professional tool for Molarity, Molality, and Dilution.

Leave one field blank to calculate its value.

Leave one field blank to calculate its value.

Formula: M₁V₁ = M₂V₂. Leave one field blank.

Ensure volume units for V₁ and V₂ are consistent (e.g., both mL or both L).

Worked Examples: Molarity, Molality, and Dilution

Example 1: Molarity from mass

Dissolve 5.84 g NaCl (M = 58.44 g/mol) in water and make to 0.500 L. Find molarity.

  1. n = m/M = 5.84 / 58.44 = 0.0999 mol.
  2. Molarity M = n/V = 0.0999 / 0.500 = 0.200 M.

Example 2: Molality from mass of solvent

Add 10.0 g glucose (M = 180.16 g/mol) to 90.0 g water. Find molality (m).

  1. n = 10.0 / 180.16 = 0.0555 mol.
  2. Mass solvent = 0.0900 kg. m = n/kg solvent = 0.0555 / 0.0900 = 0.617 m.

Example 3: Dilution (M1V1 = M2V2)

Prepare 250 mL of 0.100 M HCl from 2.00 M stock. Find V1.

  1. V1 = (M2V2)/M1 = (0.100×0.250)/2.00 = 0.0125 L.
  2. So, measure 12.5 mL of stock and dilute to 250 mL.