Science Lab Report INTRODUCTION |NAME: LORRAINE |LAB PARTNER: KAREN HO | |LAB EXPERIMENT: TESTING OSMOSIS WITH A POTATO |LAB DATE: NOV. 23rd / 2012 | |CLASS: Y-11-C |PERIOD:C | OBJECTIVE The weight of the potato slices will increase‚ decrease‚ or remain
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11. Then add the benedict’s solution to the sucrose beaker. Put water in the 400ml beaker‚ and put it on the hotplate to start to boil the water. 12. Then stand the test tubes in boiling water for a few minutes. 13. A color change through green to yellow‚ brown and finally to red indicates the presence of reducing sugar. 14. Repeat 3 times‚ washing the materials each time you finish one cycle 15. Then you have our standard for have a standard for the rest of the experiment. 16. Then you have a standard
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varying the concentration of sucrose solution on osmosis in a potato. Preliminary Experiments One preliminary experiment was done before the main experiment. From the preliminary‚ we were trying to find out how osmosis actually occurred in potatoes‚ and gave us a vague idea on what the main experiment would be like. This preliminary will aid my prediction‚ which is stated below. The following apparatus was used for the preliminary: * 1 large potato (skin intact) * 3 boiling tubes
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Sophie Murdock Osmosis Lab Osmosis in Plant Cells: Solution Initial Volume (mL) Final Volume (mL) Percent Change Distilled Water 0.8 1.0 125% 0.4% NaCl 0.5 0.8 160% 0.9% NaCl 0.6 0.8 133% 5% NaCl 0.6 0.5 83% 10% NaCl 0.6 0.5 83% 8. The cells in the solutions of distilled water‚ 0.4% NaCl‚ and 0.9% NaCl would all appear to be inflated and could burst. This is due to the fact that the solution is hypotonic to the potato‚ thus water is entering the cell. Meanwhile‚ the cells in the solutions
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Osmosis Lab Conclusion The purpose of this lab is to determine whether salt affects the movement of water in the cell. Independent variable is the factor that affects the value of variables dependent to it. In osmosis lab‚ the independent variables are the potato and onions. The dependent variable is the variable whose value is measured to determine the extent of the effect of another variable to it‚ as in an experiment. In osmosis lab‚ the dependent variable is the length of the potato. The controlled
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molecules from an area of high concentration of sucrose solution to an area of lower concentration of sucrose solution‚ through a selectively permeable membrane. The water molecules move down a concentration gradient in osmosis. Two diagrams of osmosis are shown in figures 1 and 2. Figure 1 shows the diffusion of water molecules through a selectively permeable membrane from an area of highly concentrated sucrose solution to an area of lower concentrated sucrose solution. Figure 2 shows a concentration gradient
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affect the rate of enzymes reactions. One of them is pH‚ which influence on the enzyme activity will be the subject of this investigation. Catalase of potato tuber cells will be the enzyme used in the experiment. RESEARCH QUESTIONWhat is the influence of different values of pH on the activity of catalase in potato tuber cells?VARIABLESIndependent: potato discs treatment (placing them into buffer solutions of different pH values‚ mixed with hydrogen peroxide)Dependent: the activity of the catalase‚ reflected
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Estimating Osmolarity by change in weight Abstract Water flows in and out of cells in an attempt to attain a state of equilibrium. The concentration of solutes to solvent in the cells environment is the cause of the water flow. Plant and animal cells can be negatively affected or positively affected due to the concentration balance in their environment. Potato cells were used to see the affects of sucrose in different concentrations. In some
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The Effect of pH on Enzyme Activity A piece of Solanum tuberosum (potato) was removed and mixed with distilled water in a blender. The resulting solution was filtered through multiple layers of cheese cloth to filter out the liquid by eliminating any large pieces in the solution. The solution created was catechol. Five different solutions were prepared as blanks with each test tube containing 6.0mL of a different pH (pH 4‚ pH6‚ pH7‚ pH8‚ pH10) of phosphate buffer‚ 1.0mL of the enzyme and 1.0mL of
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Retrieved October 29‚ 2013‚ from http://prezi.com/wii0fgw48euc/potatoe-enzyme-lab/ What enzyme is present in liver and potatoes. (n.d.). Retrieved October 29‚ 2013‚ from http://wiki.answers.com/Q/What_enzyme_is_present_in_liver_and_potatoes#slide2 What Is the Optimum PH for Catalase - Ask.com. (n.d.). Retrieved October 29‚ 2013‚ from http://www.ask.com/question/what-is-the-optimum-ph-for-catalase What is the optimum PH for potato catalase and why? - Yahoo! Answers. (n.d.). Retrieved October 29‚ 2013
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