Science Lab Report

HYPOTHESIS
There will be no net movement of water molecules into or out of the potato.
MATERIALS LIST

Large potato
Cutters (in the shape of a fish)
3 small beakers or clear dishes
3 glass covers
Sucrose solution
Salt
Distilled water
Paper towel

PROCEDURE

Add 200ml of distilled water, 40ml sucrose solution, and 5g salt into three beakers respectively. Record the solutions concentrations, volumes, and weights.
Use a cutter to cut the potato to a similar size. Record the weight of pieces of potato.
Put the three potatoes slice into each beaker.
Cover the beakers with glass covers and leave them for 48 hours.
Carefully remove the potato slices from the distilled water solution & pat it dry on a paper towel.
Weight the potato slices immediately.
Record the final weight of the pieces.
Clean up the equipment & area and return materials to their proper place.

DATA AND/OR OBSERVATIONS

Potato slices weight (Before)

Material

Distilled water
Potato slices weight (After)
(Quantitative)

Sucrose solution
40ml
21. 5g
2g

Salt
200ml
5g
20g

USE TIME: 48 hours
RESULTS
We can Observe that the slice placed in salt is very flexible, while the slice placed in the sucrose solution is flexible but less so. Since potatoes already have sugar, less water will diffuse out of the potato placed in sucrose solution water. The slice placed in water will be rigid since it will absorb water.
ANALYSIS ERROR
The glass can not cover the beakers well, so the data value that we got was too close. We used a big size of the cylinder (500ml) to measure the sucrose solution and distilled water.

150ml water
potato weight (before/after) 20g /24g

150ml water
potato weight (before/after) 20g/13. 5g

with 15g salt

I compared with Evan’s group, our results roughly the same.
CONCLUSION
The water molecules move towards higher concentrations of the solution. That means that if the water outside the cell is saltier than the water inside, water will move from the inside of the cell to the outside. As the water left the cell it was much like letting the air out of a balloon. As more and more of the cells lost water, the slice of potato became soft and flexible. (the potato in water with sucrose solution just on the contrary.)

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