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?
2007-05-30 04:42:48 · 1 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
Increases until it equals the osmotic pressure of the body.
Its a first order process. Osmosis and diffusion.
2007-05-30 05:23:56 · answer #1 · answered by ag_iitkgp 7 · 0⤊ 0⤋