# How do you calculate osmolarity from osmolality?

Aug 14, 2018

$\text{Osmolarity"="Moles of ions in solution"/"Litres of solution}$
$\text{Osmolality"="Moles of ions in solution"/"Kilograms of solvent}$
For most DILUTE solutions in WATER, $\text{Osmolarity"="Osmolality}$...but here we are given no data with respect to the composition of the solutions or their respective densities...so we are in no position to assess the comparison....