Why doesnt diffusion happen when osmosis happens

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zurgextoitzke
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If the water moves by osmosis from say 0 kPa to -100kPa, why doesnt whatever has lowered the water potential, like glucose for example, diffuse from the -100kPa to the 0kPa water across its concentration gradient? Or does it?
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nnth
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(Original post by zurgextoitzke)
If the water moves by osmosis from say 0 kPa to -100kPa, why doesnt whatever has lowered the water potential, like glucose for example, diffuse from the -100kPa to the 0kPa water across its concentration gradient? Or does it?
isn't osmosis a type of diffusion? one which involves water?

this website explains the differences quite clearly between osmosis and diffusion:

https://www.thoughtco.com/difference...ffusion-609191
Last edited by nnth; 1 year ago
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username5398004
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1) Osmosis is a type of diffusion.
2) We aren't allowed to give answers on here (TSR rules), but think about the fact that osmosis occurs across a partially permeable membrane and the size of the gaps in the membrane. This picture might help
Name:  Osmosis.png
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zurgextoitzke
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(Original post by ItsStarLordMan)
1) Osmosis is a type of diffusion.
2) We aren't allowed to give answers on here (TSR rules), but think about the fact that osmosis occurs across a partially permeable membrane and the size of the gaps in the membrane. This picture might help
Name:  Osmosis.png
Views: 27
Size:  29.0 KB
Its not a question im doing revision and im just curious lol. I think i get it now cuz of the partially permeable membrane stops the glucose moving back. I should probably get back to revising lmao
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username5398004
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(Original post by zurgextoitzke)
Its not a question im doing revision and im just curious lol. I think i get it now cuz of the partially permeable membrane stops the glucose moving back. I should probably get back to revising lmao
Oh ok. Yeah, glucose is a large molecule, so it can't fit through the membrane, meaning the only way to reduce the gradient is for osmosis to occur. Hope it helped. Good luck!!
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