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  SCIENCE LAB REPORT  By:Kade Soderstrom Kade Soderstrom 10.24.2016 Biology INTRODUCTION In this lab we are experimenting with buffers. Buffers are solutions that resist changes in pH level when acid or or alikia is added.  HYPOTHESIS If NaOh is added to beef liver it will not change. If NaOH is added to potato the pH level will decrease. If NaOh is added to water the pH level will rise. PROCEDURE 1.Record a pH level of each of the solutions without anything in it. 2.Drop 5, 10, 15, 20, 25, 30 drops of HCI in Tap Water and record each time you drop 5 more drops in. Repeat with the Liver and potato. (clean off the pH tester in between solutions) 3.Repeat with NaOH DATA Solution Number of drops 0 HCI Tap Water 7.26 6.06 3.63 2.32 2.01 1.82 1.62 Liver 6.11 6.01 5.86 5.7 5.57 5.48 5.41 Potatoe 5.93 5.71 5.43 5.2 5.03 4.94 4.74 NaOH Tap Water 7.82 9.36 9.83 10.18 10.49 10.82 11.11 Liver 6.4 6.25 6.3 6.35 6.3 6.35 6.43 Potato 6 6.16 6.3 6.45 6.7 6.9 7 1    CONCLUSION We found out that the HCI was an acidic solution because when put in the water the pH level dropped. But then we also found out that the liver and potato have buffers in them because when we put the HCI in it resisted the pH change. Let me remind you that there was change but very little change as opposed to the tap water. With the NaOH we found out that it is a base because the pH level of the water rose when we put it in there. But same with the HCI the live and the potato resisted the change. This is because the buffer resist bases as well. In conclusion the evidence shows that organic living organisms solutions contain buffers that resist change in pH level to maintain a state of homeostasis. 2

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Jul 14, 2019
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