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What is the effect of different concentration of salt solution on the rate of osmosis in solanum tuberosum (potato)?

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Biology Internal Assessment IB Biology- Internal Assessment Lab Report * Osmosis experiment- Solanum tuberosum (Potato) Research Question: What is the effect of different concentration of salt solution on the rate of osmosis in solanum tuberosum (potato)? Hypothesis: The potato will lose weight and become shrank when they are put in salt solutions. The higher concentrated the solution, the more the potato shrinks. Osmosis is the passage of water at a cellular level from an area of low solute concentration to an area of high solute concentration through a membrane along a concentration gradient in order to equalize the level of water in each region. When potato strips are placed in concentrated salt solutions, they lose water by osmosis and they become "flaccid". They become swollen and hard. When the salt solution becomes more concentrated, more water would move out from the potato by osmosis. ...read more.


Repeat Step 4. for 1.00M, 2.00M, 3.00M and 4.00M concentration solutions with 5 strips each. 2. After 24 hours, place the potato strips again on the scale and work out the percentage change. Data collection: Table 2- Raw Data Table – Mass of Potato Strips – Pre- & Post-Experiment NaCl Concentration/M Potato Samples Initial Mass /g±0.01 Mass after Solution /g±0.01 0.00 Potato 1 8.60 2.21 Potato 2 9.20 2.02 Potato 3 9.40 2.03 Potato 4 8.70 1.98 Potato 5 8.90 2.10 1.00 Potato 1 8.65 1.71 Potato 2 9.45 1.54 Potato 3 8.70 1.78 Potato 4 9.45 1.66 Potato 5 8.95 1.68 2.00 Potato 1 9.10 1.52 Potato 2 8.35 1.43 Potato 3 8.95 1.66 Potato 4 9.15 1.73 Potato 5 8.65 1.45 3.00 Potato 1 8.15 1.46 Potato 2 7.95 1.36 Potato 3 9.75 1.27 Potato 4 8.85 1.38 Potato 5 8.75 1.25 4.00 ...read more.


Standard deviation 0.00 -74% -77% 0.02 -78% -78% -77% -76% 1.00 -82% -81% 0.01 -82% -81% -81% -81% 2.00 -83% -83% 0.01 -84% -82% -84% -83% 3.00 -83% -85% 0.02 -83% -87% -84% -86% 4.00 -92% -91% 0.02 -87% -92% -92% -91% Graph 1- The above average and standard deviation are plotted in the graph below to show the relationship to the percentage change in the mass of potato strips. Conclusion In conclusion, the results indicate that the concentration of salt solution have a correlation with the percentage change in mass. Graph 1 supports this theory. The higher the concentration of salt solution, the larger the percentage change in mass of potato strips. (The y-xis is in negative figures). The results for my control experiment did not turn out as I predicted. Instead of swollen, the strips also shrank after 24 hours in distilled water. ...read more.

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