Aqueous solutions introduced into the bloodstream by injection must have the same osmotic pressure as blood; that is, they must be "isotonic" with blood. At 25C, the average osmotic pressure of blood is 7.7 atm. What is the molarity of an isotonic saline solution (NaCl in H2O)? Recall that NaCl is an electrolyte; assume complete conversion to Na and Cl ions. The equation I have for osmosis is π=MRT (π=pressure, M=molarity, R=constant, T=temperature), but in the text it says this is for nonelectrolytes. I'm not sure where to go with this.