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Osmosis
Osmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membrane. ...
Osmosis is the diffusion of water molecules through partially permeable membrane, from a dilute to a concentrated solution. ...
Osmosis occurs in living cells. ... An example of this is in the root hair cell, where osmosis occurs and allows for water to be taken into the plant from the soil. ...
When osmosis occurs in animal cells they can swell too much and burst because they have no cell wall, otherwise known as haemolysis.
Osmosis is also used in preservation. ...
The aim of this investigation is to observe the rate of reaction (of osmosis to take place) with different amounts of granulated sugar in the sugar solution. ...
Apparatus
· Stop Clock - to time our experiment
· Cutting tile - to cut the potato on
· Knife - to cut the potato
· 25cm Measuring cylinder - to measure the solutions
· Distilled water - part of the experiment
· sucrose - part of the experiment
· Potato pieces - part of the experiment
· Tissue paper - to dry the potato pieces after the osmosis takes place
· Balance - to weigh the potato pieces
· Cork borer - to cut out potato cylinders
Fair Test
Fair testing should play a big part in this experiment. ...
After 1 day, I will take all of the potato pieces out of the test tube, so that the actual osmosis action stops, and I will put the potato pieces onto one piece of dry towel, in their own groups. ...
Since the rate of osmosis will be temperature dependant then we felt that having our tubes in the laboratory for 24hrs would balance out over the length of the experiment.
Prediction
When osmosis occurs it would be noticed that more water molecules will flow from side of the potato cells that contains more water molecules, to the side that contains less of them and that also contains more solute substance dissolved within (in this case granulated sugar). Therefore I believe the higher the concentration of granulated sugar in the sugar solution, the more osmosis will occur. ...
This will occur because the fact that the sugar solution is more highly concentrated will cause the distilled water (weaker solution) to be drawn and attracted to osmosis and flow towards the sugar solution. ...
Osmosis-diagram A
KEY
Water molecule
Solute molecule
As one can see in the weak solution there are less solute molecules and more water molecules. ...
Osmosis-diagram B
Relating to prediction
Table of results
Water 1. ...
The rate of osmosis cannot continue forever decreasing and in the graph we see a decreasing rate with higher concentration.
Approximate Word count = 2067
Approximate Pages = 8.3
(250 words per page double spaced)
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