Error On Burette
than where it really is. Looking up at the meniscus causes it to appear lower than it really is. 3. Delivering the liquid too rapidly, so that drops form on the side of the buret. 4. Not reading the buret properly or to the correct number of decimal places. Buret Menu Laboratory Information General Chemistry Help Homepage
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the graduation marks. Since your buret is graduated to 0.1 mL, you will read your buret to 0.01 ml. The second decimal place http://genchem.rutgers.edu/sfburet.html is an estimate, but should be recorded. You fill the buret to the http://www.slideshare.net/diverzippy/uncertainty-and-equipment-error 0.00 mark with your solution, making sure there are no air bubbles in the buret itself, the stopcock or in the buret tip. The 0.00 mark is near the top. When filled to the 0.00 ml mark the buret is saying " 0.00 mL of the solution has been delivered." READING the BURET error on Remember the numbers start at 0.00 on top and go to 25.00 on the bottom The curved surface at the top of the liquid level is called a meniscus. You read the liquid level using the bottom of the meniscus. The meniscus is created by surface tension of the liquid and the extent thatthe liquid "wets" the wall. Part of the structure of the meniscus involves error on burette reflection of light. Therefore the meniscus, as you see it, is dependent on the background. Buret reads........ 15.46 mL(right) 15.48 mL(left) Note: the .02 mL difference is not an error because your reading of the initial volume in the buret would also differ by the same amount. Therefore the amount of liquid delivered will be the same regardless of the background, as long as the background is kept constant. ... PARALLAX ERROR The above two views of the buret are taken with the eye at the same level as the liquid level. If your eye is either higher or lower than the liquid level, you will make an error in reading the liquid level This is referred to as a parallax error On the left, the buret is being red with the eye well above the liquid level... 15.30 mL On the right, the buret is being read with the eye well below the liquid level.... 15.60 mL Since, except for the 90o angle where no parallax error occurs, you probably will not reproduce an arbitrary angle at which you read the meniscus. Therefor this will cause an error. © R. W. Kluiber 5/26/2000
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