Osmotic Pressure Dialysis Tubing
Summary
TLDRThis educational video demonstrates the concept of osmosis using dialysis tubing, a semi-permeable membrane. The experiment involves placing molasses inside the tubing and submerging it in water. After two hours, the molasses in the tubing with water becomes less viscous, indicating that water molecules have passed through the membrane, diluting the molasses. This change is attributed to osmotic pressure, showcasing the principle that small molecules can pass through a semi-permeable barrier while larger ones cannot.
Takeaways
- 🧪 Dialysis tubing is a semi-permeable membrane used to demonstrate osmosis.
- 🌀 Large molecules like molasses cannot pass through the small pores of the tubing.
- 💧 Small molecules, such as water, can pass through the membrane.
- 🔬 The experiment compares the osmotic pressure inside and outside the tubing.
- 📏 Two samples are prepared: one with molasses inside the tubing and one without.
- 🎚️ The control sample remains unchanged, showing no effect of osmosis.
- ⏱️ The experiment is observed over a period of 2 hours to observe changes.
- 📈 A significant change in volume is observed in the sample with molasses.
- 📉 The viscosity of the molasses inside the tubing decreases, indicating dilution.
- 🔍 The water molecules move through the tubing, driven by osmotic pressure, diluting the molasses.
Q & A
What is dialysis tubing?
-Dialysis tubing is a semi-permeable membrane that allows small molecules to pass through while preventing the passage of larger molecules.
How does the size of molecules affect their ability to pass through dialysis tubing?
-Small molecules can pass through the tiny holes in the dialysis tubing, while larger molecules cannot due to their size.
What is the purpose of using molasses in the dialysis tubing experiment?
-Molasses is used to demonstrate the concept of osmosis, as its large molecules cannot pass through the semi-permeable membrane, and to observe changes in volume and viscosity due to water molecules passing through.
What is the role of the control in the dialysis tubing experiment?
-The control in the experiment is a dialysis tubing filled with molasses that is not placed in water. It serves as a comparison to the test sample to observe the effect of osmotic pressure.
How long does the experiment last before observing results?
-The experiment is observed after 2 hours to see the effect of osmotic pressure on the molasses inside the dialysis tubing.
What change in volume is expected in the dialysis tubing containing molasses?
-An increase in volume is expected as water molecules pass through the semi-permeable membrane into the dialysis tubing, diluting the molasses.
What is the expected change in viscosity of the molasses after the experiment?
-The viscosity of the molasses is expected to decrease as it becomes diluted with water that has passed through the dialysis tubing.
What evidence supports the fact that water molecules moved through the dialysis tubing?
-The change in volume and the decrease in viscosity of the molasses inside the dialysis tubing after the experiment indicate that water molecules have moved through the membrane.
What is the driving force that causes water molecules to move into the dialysis tubing?
-Osmotic pressure is the driving force that causes water molecules to move through the semi-permeable membrane into the dialysis tubing, diluting the molasses.
Why does the control dialysis tubing remain unchanged?
-The control dialysis tubing remains unchanged because it is not exposed to water, and thus there is no osmotic pressure acting on it to cause dilution.
Outlines
🧪 Osmosis Experiment with Dialysis Tubing
The paragraph describes an experiment using dialysis tubing to demonstrate the concept of osmosis. Dialysis tubing acts as a semi-permeable membrane, allowing small molecules to pass through while blocking larger ones. In the experiment, molasses is placed inside the tubing to simulate a cell. One piece of tubing serves as a control, while the other is submerged in water. After two hours, it is observed that the molasses in the water-filled tubing has become less viscous, indicating that water molecules have passed through the membrane, diluting the molasses. This change is attributed to osmotic pressure, which is the driving force for the movement of water molecules into the tubing. The control tubing shows no change, providing evidence that the semi-permeable membrane selectively allows certain molecules to pass through.
Mindmap
Keywords
💡Dialysis Tubing
💡Semi-permeable
💡Molecules
💡Osmosis
💡Osmotic Pressure
💡Molasses
💡Control
💡Viscosity
💡Volume
💡Beaker
💡Results
Highlights
Introduction to dialysis tubing as a semi-permeable membrane.
Explanation of how molecules of different sizes interact with the membrane.
Concept of osmotic pressure and its role in the experiment.
Use of molasses within the dialysis tubing to simulate a cell.
Tying off the dialysis tubing to contain the molasses.
Setting up a control experiment with untied dialysis tubing.
Placing the dialysis tubing in water to observe osmotic effects.
Expectation of observing changes in volume after 2 hours.
Observation of volume change as evidence of osmosis.
Comparison of viscosity in the dialysis tubing before and after the experiment.
Demonstration that water molecules have moved through the dialysis tubing.
Dilution of molasses as a result of osmotic pressure.
Control experiment remains unchanged, highlighting the effect of osmosis.
Practical application of osmotic pressure in understanding cellular processes.
Visual evidence supporting the theory of osmosis through the experiment.
Conclusion that the experiment successfully demonstrates the principles of osmosis.
Transcripts
this is dialysis tubing and a dialysis
tubing is a membrane that if we put a
compound inside like water or
molasses if the molecules are very large
they can't pass through the little tiny
holes in the membrane but if they're
very small they'll pass through that's
why it's called
semi-permeable little things will pass
through but not big things so what we're
going to do to test that osmotic
pressure inside and outside is we're
going to use this as if it were a cell
we're going to take the molasses and
pour into our dialysis tubing and then
we're going to tie it we're going to
make two like this one will'll use as
our control the second one will put in a
beaker of
Water 2 hours later let's see what our
results are you can see definite change
in the volumes and if we move this
around you can see that in this larger
volume the Molasses is not nearly as
viscous so we have plenty of evidence to
support the fact that the water
molecules move through the dialysis
tubing and it's diluted the molasses so
the osmotic pressure was the driving
force that brought the water in
and this one remained unchanged
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