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Semipermeable membranes


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5 replies to this topic

#1 electros

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Posted 25 August 2019 - 02:56 PM

Hello

 

What it the pressure needed for water to pass through a semipermeable membrane that is permeable to water but not ion solutes?

 

Thanks



#2 bob1

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Posted 25 August 2019 - 08:23 PM

None - they work on osmosis.



#3 electros

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Posted 26 August 2019 - 05:25 AM

But in this video, they have a water solution inside a semipermeable membrane and it does not leak:

 

https://chem.librete...tudies/Dialysis

 

So how does water pass through the membrane without pressure?



#4 bob1

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Posted 26 August 2019 - 05:39 AM

It is passing through - by osmosis - from high concentration to low concentration. It's just that it is coming out in molecular form and evaporating. The holes are too small for water to squirt/drip out of, but I bet if they left that membrane to sit it would dry out eventually.



#5 electros

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Posted 27 August 2019 - 04:38 AM

Is there any method of semipermeable separation with higher water throughput?

#6 bob1

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Posted 27 August 2019 - 05:28 AM

What's the application? To concentrate the solute or to get pure water out?






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