Egg Osmosis Lab Day 1

AD
by Anne DeRousse1 view·Updated Nov 16, 2021
Re-use contentCreate your own

Chapters

Instructions for Day 1 of the Egg Osmosis Lab.

Audio TranscriptAuto-generated

  1. Mhm
  2. Sure.
  3. Good morning scientist.
  4. I thought it would be helpful if I went ahead and explained
  5. to you the lab that you're going to be doing today.
  6. So if you would go to canvas and if you would
  7. download the egg lab
  8. into note ability and open that.
  9. I am going to walk you through the instructions today.
  10. If you look at page one
  11. it goes through the background for today. The problem is to observe osmosis in a cell
  12. as moses is the diffusion of water across a selectively permeable membrane.
  13. This means that water can go through membranes from
  14. areas where there are a lot of water molecules,
  15. two areas where there are not so many molecules
  16. to perform their functions. Cells must keep an internal
  17. steady state
  18. balanced state. Even when the environment outside of the cell is changing,
  19. this steady state is called homeostasis.
  20. Homeostasis is maintained in part by controlling the movement
  21. of materials into and out of the cell.
  22. To achieve this control cells are surrounded by
  23. a membrane that can tell different substances apart
  24. and can slow down or stop the movement of
  25. some substances while allowing others to pass through freely.
  26. Because not all substances can go through the cell membrane equally well.
  27. The membrane is said to be selectively permeable,
  28. selectively permeable membranes are those that
  29. have openings called pores that let
  30. water oxygen carbon dioxide and certain
  31. other small molecules go through the membrane
  32. cells in the human body needs a constant supply of oxygen and water.
  33. They're also making carbon dioxide as a waste and
  34. this needs to be removed from the cell.
  35. These substances can move into and out of a selectively permeable membrane
  36. around a cell through the process of osmosis.
  37. So if you look
  38. at page two,
  39. if you scroll through actually, you'll see that this lab is going to take four days.
  40. So as you're looking,
  41. your
  42. lab table
  43. is set up
  44. with
  45. a scale.
  46. See if I can get you to see that better. There you go. A scale, an egg in a way boat,
  47. A beaker
  48. that for today, I have already pre filled with the 200 mg of vinegar.
  49. You have a paper towel
  50. and a spoon. So if you look
  51. at
  52. The Procedure for Day one
  53. you are told to
  54. observe the egg.
  55. So
  56. you simply want to pick up the egg
  57. and look at it as a scientist, use all of your senses, feel it, um
  58. smell it. Just.
  59. Anything that you can think to notice about the
  60. egg you were going to write on page four
  61. Where it says Day one Observations Raw egg,
  62. you want to fill up as many of those lines as you possibly can.
  63. All right, If you look at number two,
  64. it says to use the scale to find the mass of your egg and then record it.
  65. You're going to record the mass
  66. on page five.
  67. Now
  68. the first thing that you're gonna want to do
  69. is turn on your scale
  70. And this one's already turned on.
  71. But if you remember to turn on your scale,
  72. you're going to press the on button until you see 0.0
  73. and you should see a G for graham there.
  74. If you don't just move this unit button until you see graham,
  75. you're going to then put your way boat on the scale
  76. and then if you remember, we want to get rid of the mass of the way boat,
  77. so we're going to zero it.
  78. So when it says 0.0, you're ready to put your egg gently in the way. Vote
  79. This egg is 62.2 g. And so I would record that
  80. in this first box
  81. where it says mass of egg,
  82. Make sure to put the unit label. So I would write 62.2 g. Here.
  83. The next box is asking for the volume of liquid.
  84. Now, in the procedure it says to pour 200 mg mm. I'm sorry, a vinegar into the beaker.
  85. Now,
  86. if you'll notice on the beaker,
  87. they have graduated marks that help you to measure and determine the volume.
  88. So if you hold it up to eye level,
  89. yours should be right on that 200 millimeter.
  90. If it's not let me know. So I can correct that.
  91. So you should have 200 ml of vinegar in your beaker.
  92. Number five says to gently
  93. put your egg into the beaker. So you can use the spoon,
  94. put the egg gently on the spoon. I'm not gonna put this one in.
  95. But literally you're just gonna gently set it down into the egg
  96. And then number six says,
  97. set the beaker aside so that's all you're going to do for today.
  98. So when you're finished, if you would please um rinse off your spoon
  99. and then set
  100. the lab station up.
  101. Like it was when you got there
  102. so that the next class is ready to go
  103. And that is all for day one. When you're finished go back to the classroom area and we.