How does water affect osmolarity?
It is important to understand that osmolarity differs from molarity. The molarity of a solution is the amount of moles that can dissolve in a liter of solution. The equation for molarity is
Molarity(M) = (Moles of solute/liters of solution) = (mol/L)
Osmolarity is when individual particles affect a whole system. In other words, osmolarity is the total molarity that each particle in a system owns.
"Molarity vs. Osmolarity." Khan Academy. Web. 10 June 2015.