Experiment on Osmosis

GCSE Human Physiology and Health An test to investigate what run into sucrose effect has on stump spud tissue. Background Osmosis is the movement of peeing system seawallecules, across a partially perme able-bodied membrane from a component part of high concentration of water to a low concentration of water groinecules. A partially permeable membrane is a membrane with holes in it small enough for only water to go by means of it. unsound molecules like glucose cannot fit through it. Osmosis supports plants to take in water through their roots, and is in any case used in kidney dialysis machines to filter the blood.Aim The aim of this experimentation is to investigate how stump spud tissue changes when carryd in sucrose solving of different concentrations. I want to find push through if and how osmosis differs, when the concentration is changed. The persistent Variables There are several fixed variables I can give in order to get a different pop outcome to my expe riment 1)Temperature of the atmosphere in which the investigation takes place 2)Surface on which the investigation takes place 3)Length of time in which the chip is submerged in the solution 4)Position of potato chip )Size of potato chip 6)Amount of solution 7)Concentration of solution. Diagram Method 1,2,3&0384) cooperate all the equipment pauperismed, as per the list below. A range of sucrose solutions lead thusly be prepared with concentrations of 0. 00 hoagie, 0. 25 molar, 0. 50 molar, 0. 75 molar and 1. 00 molar. You will need to measure 15ml of distributively of the solutions in a meter cylinder. You can check that the volume is at the correct measurement, by twist down to eye level. This will give you an accurate reading. You can also alter the concentration by using a pipette.You will then place each 15ml of solution into the correct specimen tubes. You then need to add a label to each specimen tube to notify what sucrose solution is in what. For organisations sake, we set up all of the specimen tubes at once, and labelled them individually to avoid cloudiness later on. You should end up with 3 test tubes of each solution (15 test tubes in all). (5&0386) A large potato will be selected and using a number 4 cork borer, push out 15 pieces. A poker will be used to kick downstairs each piece of potato from the borer. 7) You should then cut, with a scalpel, the pelt from the ends of the potato. The skin is waterproof therefore if you were to leave the skin on, it will not allow the water to enter the potato evenly. (8) You will then measure, with a ruler, each potato, at 20mm. You will need to measure each potato in mms because it will give a more accurate measurement. Cut with a scalpel and repeat this 15 times. This part of the preparation must be make very accurately as a change in the show area may allow more or less osmosis to occur. 9) The great deal of each potato will be measured, on a 2 decimal place deliberation scale. (10) Record e ach potato fix in a table. (11) The potato tubes will then be rigid into the test tubes, taking care to place each potato in each specimen tube according to your table. It is important to keep a record, to control which potato has gone into which sucrose solution, for the results to create an accurate conclusion. (12) take in the stopwatch and leave the potatoes to soak in the sucrose solution for 30mins. (13) afterward 30 minutes, empty each specimen tube, leaving only the potato inside. 14) Before you weigh each potato again, you need to dab them with a authorship towel. If excess water were left on the potato, the weights would not be accurate. (15) Repeat this with the 14 potato tubes left. Once all the potatoes are out of the solution, the potato tubes need to be measured on the same weighing scales used before (2 decimal places). (16) Record the results. By doing the experiment 15 times at once, this will save time, but will also, hopefully produce more accurate results f rom which I will be able to draw a more accurate conclusion. Table Of ResultsConcentrationLength (mm)Weight (mm) Before afterwards 15ml of 0. 00 mol dm-320mm 15ml of 0. 00 mol dm-320mm 15ml of 0. 00 mol dm-320mm 15ml of 0. 25 mol dm-320mm 15ml of 0. 25 mol dm-320mm 15ml of 0. 25 mol dm-320mm 15ml of 0. 50 mol dm-320mm 15ml of 0. 50 mol dm-320mm 15ml of 0. 50 mol dm-320mm 15ml of 0. 75 mol dm-320mm 15ml of 0. 75 mol dm-320mm 15ml of 0. 75 mol dm-320mm 15ml of 1. 00 mol dm-320mm 15ml of 1. 00 mol dm-320mm 15ml of 1. 00 mol dm-320mm Graph See graph paper added Safety IssueRiskManagement Glass tileIf it breaks you could cut yourself.Take care when knock overling. Keep the tile in the middle of the bench to ensure you dont cuff it off. ScalpelCould cut your fingers if not handled correctlyMake sure your fingers are out of the way when savage the skin off the end of the potato. Cork BorerCould go through your hand if holding the potatoMake sure the potato is placed on the white tile. Equipment 1)Weighing scales at 2 decimal places. 2)White Tile. 3)Pipette. 4)Scalpel. 5)Measuring cylinder. 6)Potato. 7)Paper towels. 8)Number 4-cork borer. 9)Poker. 10)Ruler. 11)15 specimen tubes. 12)15 labels for sucrose solution.