Primarygun Posted September 10, 2004 Share Posted September 10, 2004 Why water flow from high concentrated solution to low? Isn't the pressure of the mixture of sodium chloride+water exerts a higher pressure to the lower? Hence, the salt+water would flow to the low one. But, in fact, the truth contradicts this. Why? I hope I can find out the answer Link to comment Share on other sites More sharing options...
Skye Posted September 10, 2004 Share Posted September 10, 2004 Water molecules move both ways as they jiggle about. But there are more water molecules on one side than the other, so more will flow from this side to the other until both sides even out. Link to comment Share on other sites More sharing options...
swansont Posted September 10, 2004 Share Posted September 10, 2004 The concentration evening out is due to diffusion. (Fick's law) Osmosis will occur with an appropriate semi-permeable barrier in place. Osmosis is a reversible process, but diffusion is not. Link to comment Share on other sites More sharing options...
Primarygun Posted September 11, 2004 Author Share Posted September 11, 2004 What about if X(a substance)+water mixture have a higher pressure than pure water on the other side? Is the process reversible? Link to comment Share on other sites More sharing options...
Skye Posted September 11, 2004 Share Posted September 11, 2004 Yeah, you can pump water through a semi-permeable membrane to purify it. There was a thread on it a while ago. Link to comment Share on other sites More sharing options...
Primarygun Posted September 11, 2004 Author Share Posted September 11, 2004 I can't find the post. Would you simply tell me the answer? The pressure of mixture is higher than the pressure of water for a general osmosis. Link to comment Share on other sites More sharing options...
pulkit Posted September 11, 2004 Share Posted September 11, 2004 The process is called reverse osmosis. It is used amongst other things to purify sea water and make it fit for drinking. Link to comment Share on other sites More sharing options...
aommaster Posted September 11, 2004 Share Posted September 11, 2004 Is this similar to active uptake in plants, only with water? Link to comment Share on other sites More sharing options...
Primarygun Posted September 12, 2004 Author Share Posted September 12, 2004 And, which substance mixs with water to generate a higher pressure than pure water itself? Link to comment Share on other sites More sharing options...
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