Isotonic solution with physiological saline...

[scholesmu]

an isotonic solution contains 300 mmol/L


if i need to know the molar concentration of

for example NaCl, glucose

to prepare Isotonic solution with physiological saline


is that like to have to count the total number of molecules first?
what to do?

[greatmicrobiologist]

you have to know the normality, equivalent weight and molecular mass of the isotonic solution.

[JackBean]

an isotonic solution contains 300 mmol/L

of what? 300 mM NaCl will have other osmolarity than 300 mM MgSO4