Does Molarity of NACL(aq effect the rate of osmosis摩尔浓度的NaClaq不影响渗透速率.pptxVIP

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Does Molarity of NACL(aq effect the rate of osmosis摩尔浓度的NaClaq不影响渗透速率.pptx

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Does Molarity of NACL(aq) effect the rate of osmosis? By Don Nguyen, Erik Wislinsky, Clint Beckner, Ryan Brophy, and Jason West Purpose The purpose of this experiment is to test if the molarity of different NaCl(aq) solutions effect the rate of osmosis in a potato core. We will be testing .5% salt, 1%, 2%, and 4% Hypothesis If osmosis flows from an hypotonic environment to a hypertonic environment and we place potato cores in different percents of salt solutions, then the potato core in high % salt solutions will loss weight and potato cores in low % will gain weight. There is a certain molarity where the potato is at equilibrium and will be isotonic with respect to the solution. Procedure Get five beakers with a 100mL line Label each beaker (1-5) Fill each beaker with 50mL of distilled water(dH2O) Add .5 grams of salt to beaker 2 Add 1 gram of salt to beaker 3 Add 2 grams of salt to beaker 4 Add 4 grams of salt to beaker 5 Fill each beaker with more distilled water until the water line is at the 100mL mark Stir with scupula Get a potato Procedure (continued) Use a coring tool to get five pieces of potato Cut each piece to weigh .06 grams (g) Put one piece of potato in each beaker Let osmosis do its thing for 30 minutes When 30 minutes has past, remove each piece of potato Gently dry each piece on a paper towel (make sure not to squeeze water out of the potato and only remove excess water from the outside) Once again, weigh each piece of potato Subtract weight before soak from weight after soak for each piece If the difference is positive, the potato lost water and if the difference is negative, the potato gained water Data Concentration (Molarity) Weight of Potato Before Weight After Change in Mass (g) 0 0.6 0.8 0.2g 0.0502 0.6 0.7 0.1g 0.1004 0.6 0.6 0g 0.2008 0.6 0.5 -0.1g 0.4016 0.6 0.5 -0.1g Data Conclusion Conclusion: How does this lab relate to what you are studying? ? Purpose (restate purpose in past tense, including percent salts used.) ? Obs