Problem set: water and solute movement across membranes
In the diagram below are ECF and ICF compartments separated by a membrane permeable to water and to K+ Use this as the starting condition for the questions below.
What is the osmolarity in the ICF before any KCl solution is added?
500 ml of a 2% potassium chloride solution will be added to the ECF. What is the osmolarity of the KCl solution? (molecular weight of K= 39.1, Cl = 35.5) (KCl has a disassociation constant of 1.6)
The KCl solution is: (circle choice) hyposmotic /isosmotic /hyperosmotic to the body.
After the KCl solution is added, how does the osmolarity of the body change?
(circle your answer):osmolarity decreasesno change osmolarity increases
The K+ ions diffuse through an open ion channel into the ICF but the Cl- ions cannot move into the ICF. Which compartment has a higher concentration of non-penetrating solutes after the addition of the KCl solution (before water or solutes move)?
the ECFthey are the samethe ICF
What is the tonicity of the KCl solution?