Conditioning and filling the buret — Transcript

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1. 0:00[Music]
2. 0:07you want to fill up the burette with the
3. 0:10sodium hydroxide solution
4. 0:13now burnt
5. 0:15one can assume that they are
6. 0:18clean
7. 0:19and someone else is going to not trust
8. 0:22the people who used it before is going
9. 0:25to use with the
10. 0:27pioneers water which is a better
11. 0:29technique so you have neonice water
12. 0:32and for two purposes one to make sure
13. 0:35that it's actually
14. 0:37is going to be
15. 0:39working
16. 0:40so the sample is not clogged or it's the
17. 0:43it's working properly
18. 0:46then you are going to rotate the buret
19. 0:49like this
20. 0:51to make sure inside wall is completely
21. 0:55clean
22. 0:59next
23. 1:00we want to rinse it so we read this
24. 1:04clean
25. 1:04now we want to rinse it with sodium
26. 1:07hydroxide why do we need to reset the
27. 1:09sodium hydroxide
28. 1:12because after you wash me dry water
29. 1:14there might be some drops of the
30. 1:16deionized water you could still see
31. 1:18there here some drugs of the eye water
32. 1:20in the buret and that could dilute the
33. 1:24solution
34. 1:25that we are using so we want to make
35. 1:28sure to raise the buret with sodium
36. 1:30hydroxide
37. 1:33i'm going to always transfer to smaller
38. 1:35containers so you have you have it like
39. 1:38more control and is more manageable use
40. 1:41a small
41. 1:42plastic funnel to fill the burette i
42. 1:45only need about five to ten milliliters
43. 1:48of the solution
44. 1:49and while i'm pouring the solution in i
45. 1:52have to make sure the snapcode is
46. 1:56closed
47. 1:57now take the funnel out
48. 1:59similar procedure
49. 2:01i'm going to rotate it
50. 2:03to make sure inside the burette is
51. 2:06completely rinse with the
52. 2:10with the sodium hydroxide
53. 2:12i don't need that
54. 2:14solution so i'm going to discard it
55. 2:17discard the wash solution
56. 2:31my buret is ready to be used i washed it
57. 2:34with distilled water and i rinsed with
58. 2:38sodium hydroxide i'm going to always
59. 2:40rinse it with the same solution that i'm
60. 2:43going to fill it up
61. 2:45i'm holding it
62. 2:46i'm holding the burette so you can see
63. 2:49it better otherwise this needs to be
64. 2:51secured as the
65. 2:53on the
66. 2:55red clamp
67. 2:59i put
68. 3:00higher than
69. 3:01zero
70. 3:02we've worked with this uh for experiment
71. 3:05one
72. 3:06already couple times so
73. 3:08the graduation line starts from zero it
74. 3:11goes down to fifty so i could liquid
75. 3:13more than to make it higher than level
76. 3:16of the zero
77. 3:18then
78. 3:19i'm going to dispense some out to adjust
79. 3:22it exactly at
80. 3:24zero
81. 3:26and i'm looking for the meniscus just
82. 3:28like any other cylinder shaped equipment
83. 3:31where we have
84. 3:34liquid in the cylinder shape equipment
85. 3:36going to
86. 3:37be
87. 3:40leveling at the curve
88. 3:42so we have to look for the lowest point
89. 3:45of the curve in order to read the level
90. 3:48so i need to get it down to
91. 3:51exactly
92. 3:54so you know there's sometimes there's
93. 3:55the air bubble here and if there's air
94. 3:58bubble i put it lower
95. 4:00i put it at a
96. 4:02i take more i dispense more of the
97. 4:05liquid until
98. 4:06i make sure there is no air bubble here
99. 4:09and if there is no air bubble here and
100. 4:12also making sure that this level is at
101. 4:16one now
102. 4:18so and my starting volume is going to be
103. 4:21one so initial variance reading for me
104. 4:23is going to be one at this point
105. 4:27because i had to dispense
106. 4:29some
107. 4:31more liquid out to get to get rid of the
108. 4:33air bubbles that we have
109. 4:35so
110. 4:36next
111. 4:37we have the
112. 4:39initial buret reading
113. 4:43i have one point zero zero
114. 4:46initial
115. 4:52view rest reading
116. 4:55[Music]
117. 5:02you