osmosis???

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kiekyon
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osmosis???

Post by kiekyon » Thu Feb 16, 2006 6:23 am

why cant seawater be used to water plants?

army
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Post by army » Thu Feb 16, 2006 7:52 am

if you water plants with it, the plant will suffer from dehydration. Without water, it die. See? Seawater have more salt concentration than the plant's sitoplasmic have. Water will move out, to make the osmotic pressure between seawater and sitoplasmic fluid equals.

BLaZe
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Post by BLaZe » Fri Feb 17, 2006 7:13 pm

Drinking seawater promotes dehydration because seawater is a thirsty solution. As the seawater flows through the stomach and intestine it draws water out of bodily tissues.
Notes Solutes in solutions will always flow from a region of higher concentration to a region of lower concentration. Seawater has a lower concentration of water than pure water has (because of the salt!), so water molecules will migrate toward a sample of seawater. If the seawater is in a person's stomach or intestines, water will move toward the seawater from the body's tissues, resulting in dehydration.

cool A-level student
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Post by cool A-level student » Thu Feb 23, 2006 11:55 am

sea water has a lower conc. because the salt in it attracts many of the water moelcules so that there is not a very high amount of free water molecules that can move around and enter osmosis, and so it makes us or plants very thristy

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