Science Lab Report

Science Lab floor INTRODUCTION NAME LORRAINE LAB PARTNER KAREN HO LAB EXPERIMENT TESTING OSMOSIS WITH A spud LAB DATE NOV. 23rd / 2012 CLASS Y-11-C PERIODC OBJECTIVE The metric weight unit of the spud cuts give increase, decrease, or remain the same? HYPOTHESIS There depart be no net strawman of water molecules into or out of the potato. MATERIALS LIST Large potato Cutters (in the shape of a fish) 3 atomic beakers or clear dishes 3 glass covers Sucrose root Salt Distilled water Paper pass over pic PROCEDURE 1. Add 200ml of distilled water, 40ml sucrose base and 5g salt into three beakers respectively. Record the solutions concentrations, volumes, and weights. ?Use a sculptor to cut the potato to the similar size. Record the weight of pieces potato. ?Put the three potatoes slice into each beaker. secrecy the beakers with glass covers and leave them for 48 hours. ?Carefully remove the potato slices from the distilled water solution & pat it alter on a pape r towel. Weight the potato slices immediately.Record the final weight of the pieces. ?Clean up the equipment & field of operation 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 placed in salt is very flexible, while the slice placed in 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 cylinder (500ml) to measure the sucrose solution and distilled water. 150ml water potato weight (before/after) 20g /24g 150ml water potato w eight (before/after) 20g/13. 5g ( with 15g salt) I compared with Evans group, our results roughly the same. resultant 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 permit the air out of a balloon. As more and more of the cells lost water, the slice of potato became blue-blooded and flexible. (the potato in water with sucrose solution just on the contrary. )