the spontaneous net movement of solvent molecules through a semi-permeable membrane into a region of higher solute concentration, in the direction that tends to equalize the solute concentrations on the two sides.

learn more… | top users | synonyms

0
votes
0answers
15 views

Cylindrical container with semipermeable piston

Think of a cylindrical container, with a semipermeable membrane which is like a piston, free to move. The solute concentration is initially greater to the left of the piston. The solvent will flow ...
8
votes
1answer
176 views

Can H4O 2+ form?

Like $\ce{NH4+}$ ,Is there any possibility of formation of $\ce{H4O^{2+}}$ (of tetrahedral structure)? My theory is: it can be formed by osmosis setup where heavy acids like $\ce{H3PO4}$ or $\ce{...
0
votes
0answers
33 views

Why wouldn't solvents be interchanged in isotonic solutions?

While studying osmosis, my book remarks that ...
3
votes
1answer
116 views

What happens when a semipermeable membrane allows only one solute to pass through?

I'm essentially a medical student where we deal a lot with osmosis. But when we are taught, it is done generally with only a single solute in consideration. What if two different solutes are used on ...
3
votes
0answers
31 views

How will water move across a membrane that is permeable to only one solute?

If there are two solutions separated by a membrane, which is permeable only to one solute and the solvent, will there be any net movement? Let's assume the two solutes are glucose and sodium ions, ...
1
vote
1answer
22 views

Figuring out highest osmotic pressure? [closed]

In preparing for an exam I'm trying to solve the following question. I'm clueless. What should I do? Which of the following water solutions has the highest osmotic pressure? 0.1 mole/kg NaCl 0.1 ...
1
vote
1answer
167 views

Does glycerin promote bacterial growth the same as water?

A sodium chloride + water solution draws the water out from bacteria through the process of osmosis. Would a sodium chloride + glycerin solution have the same antibacterial effect? If I understand ...
1
vote
3answers
130 views

How can semi-permeable membrane be so smart?

According to the definition, a semi-permeable membrane is a membrane that allows only solvent molecules to pass through it; solute molecules are blocked. Solvent molecules flow from the membrane side ...
0
votes
0answers
54 views

How is Gibbs-Donnan equation derived?

Could it be derived from fundamental relations of gibbsian thermodynamics and other relevant physics? Or is the equation solely representing an experimental fact that only approximates the more ...
0
votes
0answers
49 views

In osmosis why does the solvent move from pure solvent to the solution?

In osmosis, a substanec moves from region of low to high concentration. So why is it that solvents move from the region of pure solvent into the region of solution? Doesn't the pure solvent have the ...
1
vote
0answers
12 views

Does Reverse Osmosis remove elemental ions from water?

From what I understand, RO is able to remove (or at least considerably reduce) the salts dissolved in water. But thinking about it just doesn't make sense. RO works by filtering the solution using a ...
1
vote
1answer
125 views

Osmotic Pressure

If the osmotic pressure of a 0.010 M aqueous solution of sucrose at 27˚C is 0.25 atmosphere, then the osmotic pressure of a 0.010 M aqueous solution of NaCl at 27˚C is (a) 0.062 atm (b) 0.12 atm (c)...
0
votes
0answers
41 views

What's the difference between reverse osmosis and ultrafiltration?

I was recently reading about ultrafiltration in blood capillaries. In such a case, as I understood, tissue fluid moves from capillaries to tissues against the concentration gradient due to the high ...
6
votes
1answer
137 views

Can I equalise osmotic pressure using two different solutes?

I understand that there is a pressure gradient between an aqueous solution, e.g. salty water, and, say, pure water due to osmosis. My question is, is it possible to match or almost match, the osmotic ...
2
votes
2answers
131 views

Fundamental physical forces behind osmosis

I wonder which fundamental forces act behind osmosis process? Sum of these forces oppose gravity force, like in this figure: So I wonder what are these forces?
1
vote
1answer
577 views

Highest osmotic pressure

I’d like to ask a question and clear my misunderstanding. Which of the following 0.01 M solutions have the highest osmotic pressure? -$\ce{NaCl}$ -$\ce{C12H22O11}$ -$\ce{BaCl2}$ -$\ce{CO(...
1
vote
1answer
55 views

Water softener and RO filter

I have a water softener for showers and dishwasher and a reverse osmosis filter for drinking water. For convenience of the install, the RO filter is using softened water (some calcium carbonate has ...
4
votes
1answer
292 views

Why is pickle salty? How does salt get into pickle?

I know this may look like some question easily answered with common sense, but please read. If water is the solvent wouldn't the only thing that moves be water? (Osmosis) Edit: this is basically ...
2
votes
1answer
549 views

How to calculate the osmotic pressure of a sucrose solution?

The boiling point of an aqueous solution containing sucrose, $\ce{C12H22O11}$, is $101.45~^\circ\mathrm{C}$. Calculate the osmotic pressure of this solution at $35~^\circ\mathrm{C}$, at which the ...
0
votes
1answer
772 views

Converting mm Hg to mm H2O

So here's my problem : What is the osmotic pressure, noted in mm of H2O, of a solution with 125 micrograms of vitamin B12 (C63H88CoN14O14P) in 2.50 mL of H2O at 25 degree celsius. The "hint" that ...
2
votes
1answer
159 views

How to create a simple do-it-yourself procedure to measure diffusion?

While I am not asking the question here, a recent question concerning osmosis at the Bio SE caught my interest. In a nutshell that question was, given isotonic solutions of sugar inside and outside an ...
4
votes
1answer
331 views

Why is dialysis tubing impermeable to sucrose?

This question was posed a couple years ago but not answered adequately. You can view the older thread here. The cellulose membrane commonly used in high school and university labs is widely available ...
2
votes
3answers
2k views

Use of osmosis to measure molecular weight of macromolecules

How can osmosis be used to measure molecular weight of macromolecules ? Is it applied practically ?
6
votes
1answer
846 views

colloidal osmotic pressure?

The oncotic pressure or colloidal osmotic pressure is the osmotic pressure developed due to the presence of colloids in a solution. But since the colloids are not true solution, why should the ...
3
votes
2answers
190 views

How might one reduce the concentration of bubbles in their ice, from ice cube trays?

So I have been freezing ice a lot recently, and I will come out and say it, as it turns out it is, albeit unlikely, it is sometimes possible for ice to "explode." I was not so aware of this before, ...
3
votes
2answers
10k views

Why is dialysis tubing impermeable to sucrose when it should retain >12,000 Da?

While writing up a lab for biology, I realized that the dialysis tubing for sale online seemed to retain large molecules (12-14,000 Da) but didn't specify an upper bound. I learned that the tubing is ...