Science Lab Report

acquirement Lab Report INTRODUCTION NAME LORRAINE LAB PARTNER KAREN HO LAB EXPERIMENT TESTING OSMOSIS WITH A POTATO LAB insure NOV. 23rd / 2012 CLASS Y-11-C PERIODC OBJECTIVE The free weight unit of the stump spud fades lead increase, decrease, or remain the same? HYPOTHESIS There will be no net movement of weewee molecules into or fall out of the potato. MATERIALS LIST Large potato Cutters (in the shape of a fish) 3 flyspeck beakers or clear dishes 3 tripe covers Sucrose issue salt Distilled water Paper towel pic PROCEDURE 1. 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 the similar size. Record the weight of pieces potato. ?Put the three potatoes solidus into each beaker. Cover the beakers with glass covers and leave them for 48 hours. ?Carefully carry away the potato slices from the distilled water solutio n & 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) ? 21g Sucrose solution 40ml 200ml 21. 5g ? 2g X 200ml 23g ? 21g Salt 5g 200ml 20g USE TIME 48 hours RESULTS We can Observe that the slice place in salt is very flexible, while the slice laid in sucrose solution is flexible, but less so. Since potatoes already birth 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 to a fault close. ?We used a big size of cylinder (500ml) to measure the sucrose solution and distilled water. 150ml water potato weight (before/after) 20g /24g 150m l water potato weight (before/after) 20g/13. 5g ( with 15g salt) I compared with Evans group, our results roughly the same. CONCLUSION The water molecules move towards higher(prenominal) concentrations of the solution. That means that if the water outside the mobile phone 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. )