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SBI 3UO Ms C Evans Biology Lab Report Title To determine the effect of surface area on the rate of osmosis Abstract The main aim of the experiment was to determine the effect on the rate of osmosis by the changing surface area The changes were observed in the masses and surface area of the chopped potatoes which were initially of different surface area but same mass The rate of osmosis increased with increase in surface area And this increase in the rate of osmosis was directly proportional to the surface area Introduction Now the rate is given by the change over time Well the osmosis is the movement of water molecules from high concentration to a low concentration and of course a semi-permeable membrane is required for keeping the concentration difference So its the movement of molecules of water along the concentration gradient from high to low concentration through the semi-permeable membrane So the rate of osmosis is change in concentrationmoles timeseconds Now the concentration is given by molesliter And the moles are massgrammolecular massgrams So the moles are directly proportional to the mass of the substance So the rate of osmosis could even be written as change in massgramstimeseconds Materials Three beaker 200 ml each Potatoes Fries maker A knife Distilled water at room temperature A Clock Weighing machine A tong to take the potatoes out of water Brown paper Diagram Procedure All the three beakers were cleaned and dried Then the equal amount ie 200 ml of distilled water was poured in each beaker The water in all the beakers was at room temperature This was done so that the effect of temperature on the rate of osmosis could be negligible Then the potatoes were chopped with the French fries maker and
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