Design IA Osmosis.docx - IBDP BIOLOGY Effects of Solutes in...

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IBDP BIOLOGY Effects of Solutes in Osmosis Name: Sheldon goh Date: 18 th July 2014 IA Criteria Assessed: Design (D) Declaration I declare that this report I have submitted is my own original work and I have acknowledged the use of words or ideas of another person. Signature: _______________ Marks: ________________
Research question To investigate the effect of different concentrations of glucose solutions (0%, 20%, 40%, 60%, 80% and 100%) on rate of osmosis by measuring the change in mass of a grape recorded by an electronic balance over a duration of 20 minutes. Background Information Osmosis is the net movement of water molecules across a semi-permeable membrane from a region of low solute concentration to a region of high solute concentration until equilibrium is reached [1] Grapes are used as they contain water in them. When placed in a hypertonic solution, the grapes will shrink and shrivel as they lose water to the outer surroundings that have a high solute concentration. When placed in a hypotonic solution, the grapes will absorb the water molecules from the low solute concentration of the hypotonic solution, making the grape swell. In this experiment, you are supposed to measure the change in mass of the grape due to the osmosis in the grape when placed in various concentrations of glucose solutions over a time period of 20 minutes. Hypothesis As the concentration of glucose solution decreases, the rate of osmosis will increase between the grape and the glucose solution and that will result in more weight change recorded.

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