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How does the mass and length of potato slice change when left in different concentrations of Sucrose solution?

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Introduction

How does the mass and length of potato slice change when left in different concentrations of Sucrose solution? Aim The aim of the investigation is to see how the mass and length of potato slice change when left in different concentrations of Sucrose solution. Background Knowledge I know that Osmosis will be a big factor which will affect the length and mass of the potato slice. Osmosis is the flow of a substance through a semi-permeable membrane while the other substance is blocked and unable to pass through the membrane. I know that the water will travel both from and to the potato tissue. This process usually takes place along a cell wall. All this basically means is that only small particles are let through while larger ones are stopped. Prediction I predict that lower concentration of the sucrose solution the more water is carried using the process of osmosis. ...read more.

Middle

the sharp scalpel Apparatus > Test tubes > Test tube rack > Sucrose solution > Distilled water > Scalpel > Ruler > Paper > Scales > Core borer > 25cm3 measuring cylinder > Cutting tile > Potatoes > Tweezers Diagram 1) Concentration=Distilled water (0cm�) Sucrose solution (10cm�) 2) Concentration=Distilled water (2cm�) Sucrose solution (8cm�) 3) Concentration=Distilled water (4cm�) Sucrose solution (6cm�) 4) Concentration=Distilled water (6cm�) Sucrose solution (4cm�) 5) Concentration=Distilled water (8cm�) Sucrose solution (2cm�) 6) Concentration=Distilled water (10cm�) Sucrose solution (0cm�) Diagram 1 2 3 4 5 6 Method > Use the core borer to get 12 pieces of potato approximately 2 cm long > Dry the potato using the tissue paper > Then weigh the potato slices using the scales > Measure out all the different concentration above 2 times using the measuring cylinder > Put each concentration into the a single small test tube > Place the potato pieces into the solutions, put a bung in the top and leave for 24 hours > After the 24 hours ...read more.

Conclusion

0.5333333 0.566667 0.533333 0.533333 0.5 0.5 Length (cm) 40 40 40 40 40 40 After Mass (g) 0.7666667 0.533333 0.366667 0.333333 0.366667 0.233333 Length (cm) 44 40 38.66667 34.66667 35 35 Graph Conclusion From looking at my results I can see that the lower concentration of the sucrose solution the more water was carried using the process of osmosis. Therefore I can say that my prediction was correct. Evaluation I believe that my results were successfully accurate enough to show that the lower concentration of the sucrose solution the more water was carried using the process of osmosis. I could extend the investigation by gaining more accurate results. To this I could repeat the experiment yet again. I could have also made it more accurate by also taking into account that I had to dry the potatoes, I could have done this by making sure the potato was properly dried. Otherwise the mass of the potatoes would have varied more. I made very good use of the apparatus to gain the most accurate results possible. Owen Parry Biology coursework 11DB Page 1 ...read more.

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