Experiment on Osmosis

GCSE Human Physiology and Health An prove to wonder what affect saccharose dissolver has on tater tissue. Background Osmosis is the consummation of piddle breakwaterecules, across a partially permeable membrane from a region of high meanness of water to a low assimilation of water molecules. A partially permeable membrane is a membrane with holes in it small enough for sole(prenominal) water to go by with(predicate) it. Big molecules like glucose washbowl non fit through it. Osmosis allows plants to take in water through their roots, and is also utilise in kidney dialysis machines to filter the blood.Aim The buzz off of this experiment is to investigate how egg white tater tissue changes when placed in saccharose origin of different concentrations. I want to find out if and how osmosis differs, when the concentration is changed. The Fixed Variables There argon several fixed variables I screw control in order to get a different return to my experiment 1)Temperat ure of the atmosphere in which the investigating 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 regularity 1,2,3&4) gather all the equipment needed, as per the list below. A range of sucrose solutions go forth past be prepared with concentrations of 0. 00 molar, 0. 25 molar, 0. 50 molar, 0. 75 molar and 1. 00 molar. You leave need to measure 15ml of separately of the solutions in a measuring cylinder. You can check that the volume is at the correct measurement, by bending down to eye level. This allow give you an consummate reading. You can also alter the concentration by using a pipette.You will then place each 15ml of solution into the correct specimen pipings. You then need to add a label to each specimen tube to advise what sucrose solution is in what. For organisations sake, we peck up al l of the specimen tubes at once, and labelled them individually to void confusion later on. You should end up with 3 test tubes of each solution (15 test tubes in all). (5&6) A large potato will be selected and using a number 4 cork borer, excite out 15 pieces. A poker will be used to separate each piece of potato from the borer. 7) You should then cut, with a scalpel, the pare down 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. get along with a scalpel and repeat this 15 times. This part of the preparation must be done very accurately as a change in the surface area may allow more or little osmosis to occur. 9) The mass of each potato will be measured, on a 2 decimal place weighing scale. (10) Record each potato mass in a table. (11) The potato tubes will then be placed into the test tubes, taking care to place each potato in each specimen tube according to your table. It is important to uphold a record, to control which potato has gone into which sucrose solution, for the results to create an accurate conclusion. (12) Start the stopwatch and leave the potatoes to soak in the sucrose solution for 30mins. (13) After 30 minutes, empty each specimen tube, leaving only the potato inside. 14) forrader you weigh each potato again, you need to chuck them with a paper 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 alike(p) 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 from which I will b e able to draw a more accurate conclusion. Table Of ResultsConcentrationLength (mm)Weight (mm) Before After 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 graphical record paper added Safety IssueRiskManagement Glass tileIf it breaks you could cut yourself.Take care when handling. play along the tile in the middle of the bench to ensure you dont knock it off. ScalpelCould cut your fingers if not handled correctlyMake sure your fingers are out of the stylus when cutting 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.