Investigation into osmosis, potato cylinders
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Concentration of Solution Average % Change in Volume From Original NaCl solution 0.0 Molar 13.66 0.1 Molar -6.59 0.2 Molar -27.47 0.3 Molar -18.68 0.4 Molar -18.84
Concentration of Solution Average % Change in Volume from Original Sucrose Solution 0% 22.78 0.25% -25.17 0.50% -30.42 1% -32.78 2% -54.53 Analysis
The results show that, in accordance with our hypothesis, the cylinders will expand when external solute concentration is low (high water concentration), and contract in strong solutions (low water concentration). This is due to osmosis, where water passes from weak solutions to strong solutions across a semi-permeable membrane, such as a cell membrane. The graphs of % change against solution strength show that the results tend to form a curve, crossing the x axis (where there is no change in volume), at approximately 0.07 molar concentration for the sodium chloride solution, and at approximately 0.2 % for the sucro ...
