# Question 8d211

Sep 24, 2016

As per Wikipedia Osmotic concentration, formerly known as osmolarity,is the measure of solute concentration, defined as the number of osmoles (Osm) of solute per litre (L) of solution (osmol/L or Osm/L). The osmolarity of a solution is usually expressed as Osm/L (pronounced "osmolar"),

So osmoles represent the number of moles of particles originated from the solute that contribute to the osmotic pressure of the solution of given concentration of the solute.

If there occurs no association or dissociation of molecules of solute after its dissolution then molarity and osmolarity are same .

In case of glucose no association or dissociation of molecules of solute occurs . So molarity of glucose solution is the osmolarity of the solution.
In 5% w/v# glucose solution the concentration of glucose is
$\frac{5 g}{\text{100ml"=(50g)/"1000ml"=50g/L}}$

So Osmolarity or Molarity of the glucose solution will be

$= \text{Strength in g/L"/"molar mass of glucose}$

$= \text{50g/L"/(180g/(mol))=5/18"Osm/L}$