Osmosis Investigation Essay -- GCSE Biology Osmosis Coursework

Osmosis InvestigationHow different concentrations of saccharose solution effect stump spud tissue.AimHow do different concentrations of sucrose solution effect stump spudtissue.Background InformationOsmosis is the movement of irrigate molecules though a partial(p)lypermeable membrane from an area of uplifted water potential to an area oflow water potential.High tightnessLow ConcentrationThe membrane lets small water molecules pass though save not large bingles.The flow continues until the concentration becomes the like on theinside as on the outside. This is called equilibrium.Molarity is a flyer of concentration. expectancyI predict that the potato lead change in push-down stack and in length. I believethis beca utilise severally Molarity of sucrose lead change the potatos watercontent. This leave alone happen because either the concentration allow for higherin the sucrose and redeem off in the Tubas or lower in the sucrose andhigher in the Tubers. Therefore water bequeath travel in or out of thepotatoes cell though its partial permeable membrane.Preliminary method acting I will firstly sterilise 10 rise tubes and to see tube racks Then I will cut 9 pieces of potato I will then get 3 different Concentrations of sucrose solution and add 20cm3 to each test tube Cut a 4 mm in diam tuba to 1 cm in length Now I will measure the length and mass Now place the pieces in Now leave this for 15 minutes Now I will measure the length and massPreliminary ResultsAfter we did the Preliminary see we decided to use 1 cm long 4 mmdiameter tubas. We would put them in 25 cm3 sucrose solutions. I dont pull in any actual results because the potato tubas shrivelled up in thefridge.Method1. I took two average sized ground potatoes and checked that they were both(prenominal) healthy and hard.2. Using a standard kitchen knife I raw(a) the potatoes and utilise a potato tuba to cut 18 every bit size tubas3. Using a scalpel and ruler I cut the potato into l engths of 4mm by 10mm. I had to be very careful whilst cutting the potato as the scalpel is exceptionally sharp. I then had 18 tubas4. Taking a test tube rack I placed 18 test tubes in it and then labelled them (0.00M, 0.25M, 0.50M, 1.00M, 1.50M, 2.00M)5. Using a measuring cylinder I measured out 25cm3. I then poured this carefully into ea... ...the water potential inside the tissue.To measure the tubers I think I would use a digital measurer that goesto two decimal places for accuracy and it would go to the sameaccuracy level as the top pan balance.I would to a fault increase the amount molar amounts I use, such as 0.25 and0.75. one explanation for the bad results is when the potato chipswere removed from the test tubes and dried I may well have dried somepotatoes more well than others and so some would have moreexcess water, which would add to the mass. If the sample wasrepeated I could find another way to dry the potatoes that would tick off that all were dried in the same way for the same time. I wereto repeat the experiment I would have possibly found a machine to cutthe potato as it would ensure that all potatoes would be the sameweight and dimensions. As well as the potato I could have found a moreaccurate way to measure out the solutions and to determine the molarconcentrations. Perhaps I could have used a burette. This would ensurethat I have an accurate amount of unsound in each test tube. I couldalso weigh each tuber on a more accurate scale, e.g. not to 0.00g butto 0.0000g