How is osmolarity the same inside and outside of the cell if the ions are different on both sides?

Create a diagram that demonstrates the difference between tonicity and osmolarity. Be sure to label the new solutions in each condition, draw the changes (if predicted) in cell shape/volume, and use arrows to show the movement of water relative to the cell. Please start with a red blood cell in an isosmotic solution and show what happens to cell shape and water movement when NaCl is added to the solution, or when water is added.

Equilibrium means all of the following except (which is false?) the concentration gradient for a solute is the same on either side of the membrane. molecules are in equal concentration and therefore no longer move across the membrane. there is no net movement molecules across a membrane. the water concentration is equal on either side of the membrane.

How does the lipid solubility affect the permeability of solute through biological membranes?