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Osmosis question

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Osmosis question

Postby yineng » Mon Oct 24, 2005 10:48 pm

First of all, why do molecules diffuse? And why gas diffuse more rapidly than liquid?

Here's a question I don't know how to solve either: a certain cell contains 3% salt and 97% water. How would this cell respond if placed in a distilled water solution?
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Postby mith » Mon Oct 24, 2005 11:37 pm

diffusion is related to temperature and therefore average energy...to truly understand you'll have to know and understand the gas models associated.
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Re: Osmosis question

Postby mmiaosmiling » Tue Oct 25, 2005 4:49 am

yineng wrote:First of all, why do molecules diffuse? And why gas diffuse more rapidly than liquid?

Here's a question I don't know how to solve either: a certain cell contains 3% salt and 97% water. How would this cell respond if placed in a distilled water solution?



errrr...the answer is steam pressure...
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Postby Terry K. » Tue Oct 25, 2005 1:22 pm

To answer the 3% salt and 97% H2O question, the cell would remove salt until there is an equal amount of salt in the distilled water outside the cell as inside the cell. When it reaches this state, it is called isoosmotic, which means the solution outside of the cell and the solution within the cell have the same concentration of a given compound/element/what have you. If you're still not sure, look on google for isoosmotic solution, that should give a few good sites that can lead you in the right path.
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Postby boleto pitseyagae » Tue Oct 25, 2005 1:55 pm

reply to osmosis questiop of 3% salt and 97% water.

osmosis refers to a process whereby water molecules moves from a region where there are at higher concentration to a region where there are at lower concentration through a semi-permiable membrane.

" so what is happening is that, distilled water is pure water, it does not contain anything. But cell contents is water plus salts which means distilled water into the cell and finally the cell will break and be plasmolysed
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Gas faster than Liquid

Postby Terry K. » Tue Oct 25, 2005 2:07 pm

When you think about gas, what is the first element you think of, chances are you thought of O2 or H2, well, what do you think of when you think of liquid, H2O hopefully, the reason why gas diffuses faster than liquid is because in liquid, there are many water molecules attached together. In gas, it's just a lot of H2 or O2, but none are connected because in both, with the exception of H2 because it has Hydrogen Bonding properties, the Octet Rule is satisfied and they have no need to react with anything else. Because of this, water must first be broken down to individual molecules of H2O in order to diffuse.
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Why molecules diffuse

Postby Priscilla » Thu Oct 27, 2005 11:42 pm

It's because every system has a tendency to reach equlibrium. In the case of diffusion, the equilibrium will be having the same concentration of molecules throughout the system. Therefore less dense at start will become more dense when it reaches equilibrium and denser at start will become less dense when it reaches equlibrium. So equilibrium is at a concentration between the less dense and more dense.

Gas molecules have more energy(kinetic I guess). They move faster. So they are able to diffuse faster.

As for the osmosis question: Ans is the cell will burst.
I need your help to finish answering this question: does semi-permeable membrane allow salt to diffuse out??? If yes, then equilibrium will be less salt in the cell and more salt outside.(salt diffuse out).
If not, only water can go through, then water will get into the cell and cell burst.
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