Honors chem, please help!?

Question

A time-release capsule releases a drug at a constant rate so that the concentration of the drug in the body is not so high as to damage the body nor so low as to be ineffective. The capsule has two compartments separated by an impermeable, elastic membrane. One compartment contains the drug, the other a saturated solution of sodium chloride. The outer wall of the drug compartment consists of a rigid, selectively permeable material. The wall is designed to allow only molecules of the drug to pass outward through the wall. The outer wall of the compartment containing the sodium chloride solution consists of a semi-permeable membrane. A thin, protective coating that dissolves when the capsule enters the body covers the entire capsule

What happens to the concentration of aqueous sodium chloride over time?
What process is it? What are the two functions of the elastic, impermeable membrane separating the aqueous sodium chloride solution and the drug?

Answer 1

Increases until it equals the osmotic pressure of the body.

Its a first order process. Osmosis and diffusion.

Answer 2

. Since the membrane around the salt solution is semipermeable (not a very specific definition, but I can guess what the question is asking...), water will get into the compartment containing the aqueous salt solution and concentration of salt will decrease.
2. This selective intake of water is osmosis.
3. The two functions of the elastic membrane are:
3a (obviously) to separate the salt solution from the drug.
3b (not as obviously) to stretch when water is being taken in by the compartment containing the salt solution, and at the same time to push out more of the drug (this depends on the design of the capsule)

Answer 3

1. Since the membrane around the salt solution is semipermeable (not a very specific definition, but I can guess what the question is asking...), water will get into the compartment containing the aqueous salt solution and concentration of salt will decrease.
2. This selective intake of water is osmosis.
3. The two functions of the elastic membrane are:
3a (obviously) to separate the salt solution from the drug.
3b (not as obviously) to stretch when water is being taken in by the compartment containing the salt solution, and at the same time to push out more of the drug (this depends on the design of the capsule)