Potato Lab Report

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F60B01 CELLS AND MOLECULES PRACTICAL 2: DETERMINATION OF WATER POTENTIAL OF POTATO STRIPS LABORATORY REPORT REPORT BY: - CHIN YI JING (024492), CHOONG XIN YUN (024423), LEE GAH NI (024320), RENAD SADIG (024598), and SAI SAMHARINI D/O VIGNESWARAN (024429) Introduction In order for the cells to be able to maintain their metabolic functions, various biological molecules need to pass into and out of the cell. This can be achieved by transport processes, which can be broadly classified into passive and active transport. Osmosis is a type of passive transport in cells, that occurs when there is a concentration gradient across a selectively permeable membrane (Transport across Membrane-Cells and molecules Lecture,2016) The water molecules move…show more content…
The molarity of the could be defined using the following equation (Chemistry Calculations-Laboratory Practicals in Science Lecture,2016) So, the higher the molarity of the solution, the more sucrose moles present, and thus, the fewer water moles present in the solution. This in turn creates a gradient, and so the water molecules travel from the region of their high concentration to the region of their lower concentration across a selectively permeable membrane. When the percentage change in mass is positive, this indicates that the potato strip gained mass, meaning that the movement of the water molecules was into the cell, whereas when the percentage change in mass is negative, the opposite happened. Another noticeable feature about the graph is the points that do not fall on the line. This could be an error in measurements of mass. The point where the line of best fit crosses the x-axis (% change in mass is zero) (P) was used to calculate the water potential of the potato strips by using the following table obtained from the lab manual: Molarity (moldm-3) Solute potential

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