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# Finding The water potential of Celeriac - Implementing

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Introduction

Finding The water potential of Celeriac - Implementing The method chosen to find the water potential of the celeriac was to find the concentration of the solution where osmosis would not take place and there would be no change in mass. This is because the solution will be the same concentration as the celeriac and both of the will therefore has the same water potential. To carry out the experiment a range of solutions were made. The solutions were made in boiling tubes; each boiling tube had 20cm� of solution in it. Two cylinders of known masses and different lengths were then put into the boiling tubes. The celeriac was then left in these solutions for more than 24 hours so there was adequate time for the osmosis to take place. ...read more.

Middle

0.40 6 14 20 0.30 4 16 20 0.20 0 20 20 0.00 Risk Assessment Procedure Risk Precaution Transferring liquids into and out of glass ware Glassware is easily smashed and the pieces can cut people Care must be taken in the handling of all glassware and of broken glass Using knife to cut the celeriac and carrying it to and from the bench Cutting hands or other part of body Use with caution, holding celeriac steady with forceps. Carry with blade pointing towards the floor. Using cork borer to cut cylinders of celeriac The cork borer must be used with considerable force to cut the cylinders, risk of injuring hands Ensure hands are well away and always cut down onto a white tile Use of sucrose solution Could splash out of boiling tubes into eyes. ...read more.

Conclusion

1.67 1.71 0.04 2.40 0.55 -1.62 0.57 0.62 0.05 8.77 4.39 1.72 1.72 0.00 0.00 0.60 -1.80 0.58 0.56 -0.02 -3.45 -3.80 1.69 1.62 -0.07 -4.14 0.70 -2.12 0.57 0.51 -0.06 -10.53 -11.71 1.63 1.42 -0.21 -12.88 0.80 -2.58 0.47 0.42 -0.05 -10.64 -13.80 1.71 1.42 -0.29 -16.96 0.90 -3.01 0.57 0.51 -0.06 -10.53 -15.98 1.68 1.32 -0.36 -21.43 1.00 -3.51 0.66 0.51 -0.15 -22.73 -23.78 1.53 1.15 -0.38 -24.84 *The water potential values for the equivalent sucrose solutions were obtained from the book: Biological Science 2, the soper edition on page 432 The percentage change for each cylinder was calculated by dividing the change in mass by the initial mass and then multiplying by one Hundred. Percentage change = x/n*100 Where:- x = change in mass of celeriac cylinder. N = initial mass of celeriac cylinder. ...read more.

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# Related AS and A Level Exchange, Transport & Reproduction essays

1. ## Investigate the water potential of celeriac.

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When a solute and solvent are mixed together, they produce a solution. For example, a sucrose solution is consists the solute, sucrose and the solvent, water. Osmosis can be defined as 'the movement of water molecules from a region of high water potential to a region of lower negative water potential through a partially permeable membrane' 2.

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Osmosis will occur whenever solvent is separated from solute by a selectively permeable membrane. The membrane does not have to be completely impermeable to the solute molecules. Many naturally occurring membranes allow the passage of solute as well as solvent, though not to the same extents.

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