Molarity, dilution, fundamental constants — 100% local.
Fill in 3 of the 4 fields and leave the 4th empty — it will be calculated.
CODATA values (fundamental physical constants, 2018).
Click an element to see its details.
118 elements, classified by chemical category. Standard atomic masses (IUPAC).
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Molar concentration tells you how many moles of solute are in one litre of solution. You get there in two steps: convert the weighed mass into an amount of substance, then divide by the volume.
where m is the mass (g), M the molar mass (g/mol, read from the periodic table or computed for a compound), V the volume (L) and C the concentration (mol/L). Example: 58.5 g of table salt (M ≈ 58.44 g/mol) in 1 L gives 1.0 mol/L.
Diluting a solution adds solvent without changing the amount of solute. So the product concentration × volume stays constant.
Enter three of the four values and the tool computes the fourth. To prepare 500 mL of a 0.1 mol/L solution from a 1 mol/L stock, take 50 mL of stock and make up to 500 mL.
Elements are ordered by increasing atomic number (number of protons). A column (group) gathers elements with similar chemical behaviour; a row (period) corresponds to an electron shell. The molar mass shown is the standard atomic weight, an average over the naturally occurring isotopes.
Molarity relates moles to the volume of solution (mol/L). Molality relates them to the mass of solvent (mol/kg), which makes it temperature-independent. Normality accounts for the number of charges exchanged.
From the CODATA 2018 values, the international reference for the fundamental constants.
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