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Do you know why we always write "(w/v)" or "(v/v)" at the end of the solution concentrations?
It is because due to the various densities of the chemicals, 1 mL is never 1 gram.
Therefore, to prepare a solution with correct molarity using a 100% stock, you need to take the density of the chemical into account.
This calculator will help you to correctly prepare solutions of various chemicals which are supplied in liquid form.
Just input the density, stock concentration in % and molecular weight (MW) of the chemical. (Click here to view and example.)
Density (g/L) or
Stock Concentration in %
MW (g/mol)
Final concentration in M
Final volume (mL)