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Chemistry / Chemistry 11 / Chapter 12 / Problem 93P

Chemistry | 11th Edition | ISBN: 9780073402680 | Authors: Raymond Chang

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“Time-release” drugs have the advantage of releasing the

Chapter 12, Problem 93P

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QUESTION:

“Time-release” drugs have the advantage of releasing the drug to the body at a constant rate so that the drug concentration at any time is not too high as to have harmful side effects or too low as to be ineffective. A schematic diagram of a pill that works on this basis is shown below. Explain how it works.

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QUESTION:

“Time-release” drugs have the advantage of releasing the drug to the body at a constant rate so that the drug concentration at any time is not too high as to have harmful side effects or too low as to be ineffective. A schematic diagram of a pill that works on this basis is shown below. Explain how it works.

ANSWER:

Step 1 of 3

Osmosis

When a semi-permeable membrane separates two solutions of different concentrations, the solvent diffuses through the membrane from the region of lower concentration to the region of higher concentration. A semi-permeable membrane is a membrane that is permeable to solvent molecules but impermeable to large molecules.

The movement of water molecules in and out of a cell is an example of osmosis.

Osmosis in a system continues till the two solutions separated by the membrane have the same concentration.

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