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Investigation On Osmosis.

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G.C.S.E Coursework Investigation On Osmosis. Osmosis is as follows: When a solution is separated by a semi-permeable membrane from its pure solvent or from a more dilute solution, through the membrane and into the concentrated solution. The solvent is nearly always water. Theoretically the passage of the water would go on until the concentrations on both sides of the membrane were equal. It may seem paradoxical to say that the concentrated solution is exerting an osmotic pressure when it seems, to sucking water into itself. In the experiment described above, the pressure from the concentrated solution supports the column of fluid in the delivery tube above it. The pressure can also be demonstrated by partially filling a pig's bladder with syrup, trying it tightly and immersing it in water. The osmotic pressure of the syrup causes water to pass in through the walls of the bladder, distending and sometimes bursting out by the outward pressure of the solution. Explanation of osmosis. It is not very clear why osmosis should occur, or what the properties is that make a membrane semi-permeable. One theory supposes that the membrane acts as a molecular sieve, having tiny pores in it that are too small to allow large molecules like sugar ( C6 H12 O 6 ) to pass through, but large enough to let the small water molecules (h2o) go trough. Another theory suggests that the solvent actually dissolves in the membrane and seeps through it by diffusion, while the solute molecules cannot dissolve in the membrane. ...read more.


I need to be careful not to cut my self with the knife when chopping the potato pieces or breaking the beaker as glass might go everywhere and I might cut my self. Another safety issue is that I need to put back the equipment where I find it as it could harm someone else, as they don't know where the equipment goes. How am I going to make this experiment fair? I am going to make the experiment a fair test by, making the pieces of potato the same mass in weight, also make all the timing the same, dry each of the potato pieces properly that's how I will keep my variables of the experiment fair. Below is a table which I have record the result of my experiment as you can see; Potato mass in grams. Test 1: Mass of potato; 1.34 Test 2: Mass of potato; 1.38 Test 3: Mass of potato; 1.36 Test 4: Mass of potato; 1.38 Test 5: Mass of potato; 1.34 Potato mass after; 2 minutes 2.00g 2.12 2.06 2.07 2.01 Potato mass after; 4 minutes 1.90 1.99 1.97 1.98 1.92 Potato mass after; 6 minutes 1.15 1.20 1.21 1.23 1.18 Potato mass after; 8 minutes 1.12 1.16 1.17 1.18 1.13 Potato mass after; 10 minutes 1.07 1.13 1.13 1.15 1.10 I put my results in 5 graphs as you can see at the end of my investigation there are 6 sheet 5 individual and one all together results. ...read more.


I could also use 5 people as they could dry the potato pieces quick and put them on the balance and I would record the result that's how I think I would get accurate results. Were any results a bit doggy? There was one doggy point on my graph that was at 2-4 minutes as there was a massive increase; I think that I didn't dry the potato that much so there was more mass which cause a dramatic increase in mass. How do you think you plan was? With out my plan this investigation wouldn't have been fair or not accurate at all, because in the plan I planned out what I was going to do before I started the experiment, this is one of the key concepts the plan as I told the reader what I was going to be doing so they know and understand more. In my plan I told the reader what I was going to do. How can I make my plan better? Next time, I would use a longer period of time, I would change the salt solution to different solution such as weaker and stronger solutions, and so I would have a wide range or results and have more analysing to do. I would measure the salt solution so it would be the right amount all the time and I would experiment more, more than 5 experiment and maybe record the time every 5 minutes for 30 minutes to get better results. With stronger and weaker solutions I could see where osmosis takes places like for example a weaker solution could take a long period of time for osmosis. ...read more.

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