Affect The Concentration Of Osmosis In Potato Stripss

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OSMOSIS ACROSS THE MEMBRANE
Aim
To investigate osmosis in potato tissue.
Research question
Does the concentration sucrose solutions affect the length and diameter of potato strips after being soaked in each solution for 19 hours to indicate whether the solution is isotonic, hypotonic or hypertonic to the tissue of potato strips when the temperature of the surrounding is kept constant at 27˚c?
Variables
Independent : The concentration of sucrose solutions
Dependent : The change in length of potato strips The change in diameter of potato strips
Controlled : The type of potato strips The type of solutions used The initial length of potato strips The initial diameter of potato strips
Tabulating Data …show more content…

This indicates that the solutions are hypertonic to the tissue of potato strips. Hence, water molecules diffuse out of the tissue by osmosis, making the cell to become plasmolysed and result in the decrease in length and diameter of the potato strips.

Calculating standard deviation
Concentration of sucrose solutions (%) The length of potato strips after the experiment
(cm) Average length of potato strips after the experiment (cm) Standard deviation after the experiment 0.0 4.4 4.3 4.3 4.8 4.5 4.46 0.185472
0.2 4.3 4.2 4.1 4.3 4.4 4.26 0.101980
0.3 4.0 4.0 4.0 4.0 4.0 4.00 0.000000
0.4 4.0 4.0 4.0 4.0 4.0 4.00 0.000000
0.5 3.7 4.0 3.7 3.8 3.8 3.80 0.109545
1.0 3.6 3.5 3.6 3.5 3.6 3.56 0.048990
Table 5 shows standard deviation of the length of the potato strips after the experiment

Concentration of sucrose solutions (%) The diameter of potato strips after the experiment (cm) Average diameter of potato strips after the experiment (cm) Standard deviation after the …show more content…

0.0 0.7 0.7 0.7 0.8 0.7 0.72 0.04000
0.2 0.7 0.7 0.7 0.7 0.7 0.70 0.00000
0.3 0.6 0.7 0.6 0.7 0.6 0.64 0.04899
0.4 0.6 0.6 0.6 0.6 0.6 0.60 0.00000
0.5 0.6 0.5 0.6 0.5 0.6 0.56 0.04899
1.0 0.5 0.5 0.5 0.5 0.5 0.50 0.00000
Table 6 shows standard deviation of the diameter of the potato strips after the experiment

Figure 1 shows bar chart of the average length of potato strips (cm) after 19 hours, when the concentration of sucrose solution increase

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