How can I calculate osmolarity of dextrose?
If the solution is sufficiently dilute, it will closely follow the ideal equation:
where P is the osmotic pressure (Pa), c is the concentration (moles per cubic meter), R is the universal gas constant (8.314 J/mol-K) and T is the absolute temperature (K).
Rearranging this expression allows you to calculate the concentration from a measured osmotic pressure (differential pressure across a semi-permeable membrane). You can then convert c to molarity (divide by