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Osmosis in potato experiment

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Introduction

,BIOLOGY INTERNAL ASSESMENT Osmosis experiment DCP & CE OSMOSIS IN POTATO DATA COLLECTION AND PROCESSING: a. Raw Data: table (1): initial and final weights of potato cubes at soaked in different sucrose solutions 3rd trial (final weight) (g)(�0.05) 2nd trial (final weight) (g)(�0.05) 1st trial (final weight) (g)(�0.05) Potatoes (initial weight) (g)(�0.05) Sucrose solution Molarities (mol/L) 0.7 0.8 0.9 0.6 0.1 1.3 1.3 1.3 1.1 0.2 0.9 0.7 0.8 0.7 0.3 0.9 0.9 0.9 0.9 0.4 1.5 1.4 1.5 1.7 0.5 1.0 0.9 1.0 1.1 0.6 0.8 0.9 0.8 1.0 0.7 0.7 0.7 0.7 0.9 0.8 0.4 0.5 0.5 0.7 0.9 0.7 0.7 0.6 1.1 1.0 b. ...read more.

Middle

-0.14 0.96 0.6 -17.0 % -0.17 0.83 0.7 -22.2 % -0.20 0.70 0.8 -34.3 % -0.24 0.46 0.9 -40.0 % -0.44 0.66 1.0 The previous data in table (2) is represented by the following graph in figure (1). Figure (1): the effect of sucrose solutions on the weight of potato cubes soaked at different sucrose solution molarities. CONCLUSION AND EVALUATION: Conclusion: 1. It can be concluded that solutions with molarities (0.1, 0.2, 0.3), are relatively hypotonic to potato pieces, since the potato pieces' sizes increased, when being put into them, which means that those solutions were relatively hypotonic to potatoes, so liquid moved from the solutions to the potato pieces by osmosis. ...read more.

Conclusion

When working with potato pieces, the only thing concerned was the mass, while the surface area to volume ratio wasn't, although it's a important factor affecting osmosis, as when surface area to volume ratio increases so does osmosis, and vice versa. 2. Potato pieces couldn't be cut into equal pieces, that's why percentage change was used. 3. The potato pieces was left in the solutions a whole day, which made them exposed to temperature changes. IMPROVMENTS: 1. Repeating the experiment again more than one time, and then taking the average would decrease the errors. 2. It would be better if precise machinery would be used, so that the potatoes could be cut to equal pieces, with the same mass and probably surface area to volume ratio. 3. the experiment should be isolated from temperature changes. ?? ?? ?? ?? ...read more.

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