Question

1) Suppose you made an intravenous solution, intended to be isoosmotic to red blood cells (i.e., 300 mOsm). You add 5 grams of NaCl to 800 ml of distilled water. Will this solution be isoosmotic to cells? if not, what will happen to the cells? (Will they take in water or lose water?)

How would you make 500ml of a 5% NaCl solution?

You dissolve 20 grams of glucose into water to give a solution whose final volume is exactly 400mL. What is the concentration of this solution in moles per liter?

2) Using the molecular weight of glucose, calculate the molarity and osmolarity of a 5% sucrose solution.

3) Using the molecular weight of NaCl and its dissociation constant, calculate the molarity and osmolarity of a .45% NaCl solution.

4) What is the osmolarity of an IV solution which is .45% NaCl and 5% glucose?

5) If a patient is dehydrated, what is the best IV to move water into the cells?

6) What is the best IV for a patient with severe blood loss before new blood arrives?

7) Compare the osmolarities of the following solutions:

Solution A = 1 OsM glucose. Solution B = 2 OsM glucose. Solution C = 1 M NaCl

A is _____ Osmotic to B

A is _____ Osmotic to C

B is _____ Osmotic to A

B is _____ Osmotic to C

C is _____ Osmotic to A

C is _____ Osmotic to B

Answer 1