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The aim of this experiment is to find out how different concentrations of sugar solutions effect osmosis. Osmosis is the movement of water particles from a high concentration of water to lower concentration.

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Introduction

INTRODUCTION- (aim) The aim of this experiment is to find out how different concentrations of sugar solutions effect osmosis. Osmosis is the movement of water particles from a high concentration of water to lower concentration. THE PROCESS OF OSMOSIS Henri Dutrochet, a French botanist, discovered osmosis. What is osmosis? Osmosis is a special form of diffusion: The MOVEMENT OF WATER from a dilute solution to a more concentrated one through a PARTIALLY PERMEABLE MEMBRANE. This type of membrane (also called semi-permeable) allows only water, but not other (dissolved) substances to pass through. For example: a large molecule like starch is dissolved in water. The starch molecule is too large to pass through the pores in the cell membrane, so it cannot diffuse from one side of the membrane to the other. The water molecules can, and do, pass through the membrane. However, on the side of the membrane with the starch, the starch molecules interfere with the movement of the water molecules, preventing them from leaving as rapidly as they enter. As a result, more water flows into the side, which the starch than flows out, and the starch gets diluted. If the starch (or some other large molecule like a protein) is in a cell, the water moves into the cell faster than it leaves, and the cell swells. The cell membrane acts rather like a balloon, and if too much water enters the cell, the cell can burst, which kills the cell. So cells usually have some kind of mechanism for preventing too much water from entering or pumping the water out or simply making a tough outer coat that will not rip open. VARIABLES- There are factors that may affect the rate of osmosis: - Time the potato rods are immersed in the sugar solution for. - Surface area of the potato rods. - Mass of potato - Temperature - Volume of sugar solution. ...read more.

Middle

This would guarantee that the masses at the beginning of the experiment were all of similar amounts and the cells of the potato would all be the same. Another fault that could be prevented next time would be to make sure that the water from the potato rods are blotted dry well and to make sure that there are no air bubbles in the syringe when measuring the quantity of the solutions and to make sure that none is spilt. After giving it some thought, it has been brought to my attention that the potato rod were not strictly taken out at the same time or placed in the at the same time. The slimmest difference could alter the whole results, and could alter the effect of osmosis, giving it more time to diffuse in or out. For that reason, the potato rods have to be placed in the test tubes or taken out at the exact same time. FURTHER WORK. The investigation into osmosis could be looked into in more advances. To begin with the time that the potatoes are immersed for could be longer allowing more osmosis to take place. This could show the effect of osmosis after a long period of time i.e. 24 hours. The potatoes could have been immersed in different solution or even a different pH. This could alter the rate of osmosis. Different food groups could be tested not just potatoes. Other food groups could possibly have different cell properties. The size of the potato rods could be changed to see if the size of the potato rods really makes a big impact on the experiment. The temperature could be decreased or increased to see how fast or slow osmosis takes place. "Joey's got a big 'ol butt, now I told you I'd be true. Joey's got a big 'ol butt, so I'm leavin" -Justin "To the world u might be just one person, but to one person you might be the world." ...read more.

Conclusion

Know why? {JC buts in} 'he's broke'" ~Justin and JC "Mannnn" ~JC "I just broke outta my package" ~Lance "I'm a Dancing Queen" ~Chris "Busta just Pissed on the floor" ~Lance "Wow, she's..Whoa" ~Lance "Yea, he's our favorite too" ~Chris on Justin "You know, I wanna be there for my girlfriend. I need to be a man about things." ~Lance "Everyone seems to hate my girlfriend..." ~JC "When I heard Britney tell me, that someone said we were engaged, I just about died." ~Justin "My favorite character, would have to be Topanga." ~Lance "Mine too" ~Justin "This one time at band camp...." ~Chris "I don't have many passions, the only one I stay true to, is my music" ~JC "If I were a girl, I'd date me" ~Chris "If you were a girl, I wouldn't touch you with a 10 foot poll." Justin replying to Chris "We love you. No, really. I love you. Joey...Marry Me." ~Chris to Joey. "We are a group of Dirty, Dirty boys" ~Justin "I'm a big girl. hehe" ~Joey "Word" ~Justin "1, and 2 and grab and 1, and 2 and grab" ~JC "Pure, Animal Sex" ~Lance "Lance is an animal..trust me" ~Chris "Knock Knock" Joey replies 'Who's there' "bananna" 'bananna who?' "Knock Knock" Joey once again replies 'Who's there?' "Orange" 'orange who?' "Orange ya glad I didn't say bananna" ~Lance and Joey sent in by marie "Weeeeeeeeeeeeeeee" ~Chris "When it comes to ladies, I look, give a smile, and keep on goin, hoping they come talk to me." ~Joey "Eww, get that away from me!" ~Justin **"Those darn Backstreet Boys. Too bad they aren't as sexy as me."** ~Chris **"My biggest fantasy? A big pool of jello. That's all I'm gonna say."** ~Joey **"Aren't we kinky today?"** ~Justin **"That song is not about horses."** -Lance, about Giddy Up **"You say it once and BOOOM it's a trend!"** ~Justy **"Red stands for right and blue stands for...not right."** ~Chris **"...in a desperate plea for PURE ANIMAL SEX...now that I have your attention.."** ~Lance **"I'm dating Britney and two of her dancers."** ~Lance ...read more.

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