Osmosis and diffusion via dialysis tube

Dialysis membranes for laboratory use are typically made of a film of regenerated cellulose or cellulose esters.

Observing diffusion and osmosis through nonliving membranes lab report

So you could imagine other experiments like this. Semi-permeable membrane. So first of all, let's use our terminology. Let me write that in yellow. So this is a high concentration and that's a low concentration. If these sugar molecules were not here, obviously it's equally likely for water to go in either direction. But the water molecules from the outside-- there's nothing blocking them to get in so you're going to have a flow of water inside. So let's say that the solute is sugar. They're all bouncing around. This is diffusion. Well, it's permeable to water, but the solute cannot go through the membrane.

As the HCL diffused in and reacted with the phenolphthalein, we were visually able to see diffusion at work.

Eventually-- if maybe there's a few molecules out here-- not as high concentration here-- eventually if everything was allowed to happen fully, you'll get to the point where you have just as many-- you have just as high concentration on this side as you have on the right-hand side because this right-hand side is going to fill with water and also probably become a larger volume.

The inside is hypertonic.

osmosis and diffusion lab with dialysis tubing answers

And maybe the water molecules are about that size. And so this is kind of interesting. So this is just two containers of water. Blue The solution in the bag turned blue-black in color owing to the movement of molecules of iodine from the beaker to the bag which contains starch.

Can salt pass through dialysis tubing

Maybe I'll do sugar in this pink color. If you just had a candy bar, maybe you're hyperglycemic-- or maybe you're just hyper in general. It doesn't have to be sugar. So my question is, what is going to happen in this type of container? The amino acid then forms the very soluble but highly toxic ammonium before being converted to urea and is then transported to the liver for excretion. And this lower concentration is hypotonic. Now all of this may or may not be review for you, but I'm doing it for a reason-- because I want to talk about the idea of a diffusion. But in this case, these guys-- they can't fit through the hole. Students will analyze how solute size and concentration affect diffusion across semi-permeable membranes and how these processes affect water potential. Let me do it in a slightly different container here, just to talk about diffusion.

Onitsha: African First Publishers. In this case, the molecules are going to spread in that direction from a high concentration to a low concentration area.

osmosis and diffusion experiments

And it's not just some magic. So there's still more probability that one of these guys will go to that side than one of these guys will go to that side. But I want to make it very clear-- diffusion is the idea of any particle going from higher concentration and spreading into a region that has a lower concentration and just spreading out.

diffusion through a membrane lab report

So in general, everything is moving in random directions, but you're more likely to be able to move in the rightward direction.

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