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CHEMISTRY 11 – EXPERIMENTAL UNCERTAINTY OF APPARATUS WORKSHEET. (1) Record the values for the experimental uncertainty encountered in using the following apparatus: Apparatus. Difference between numbered divisions. # of unnumbered subdivisions between numbered divisions.
If you look at a 10mL graduated cylinder, for example, the smallest graduation is tenth of a milliliter (0.1mL). That means when you read the volume, you can estimate to the hundredths place (0.01mL). Use the bottom of the meniscus to determine the volume in the 10mL graduated cylinder.
20 maj 2019 · This handbook applies to all flasks and graduated cylinders for use as field standards (i.e., new and in-use field standard volumetric flasks and graduated cylinders , those intended for replac ement of flasks already in use, and to new flasks to be acquired as supplementary standards).
Every experiment has some uncertainty caused by limitations in the equipment you use. This is unavoidable RANDOM ERROR and does not reflect on your lab technique. The table given below lists the absolute uncertainties for some equipment used in the Chemistry lab.
As you can see in the above tables, the 5 mL pipette has the lowest tolerance, and therefore the best accuracy, followed by the 50 mL burette, and the 10 mL graduated cylinder is the least accurate of the three.
All graduated glassware is read with one estimated digit, so this measurement is recorded correctly to the nearest 0.1 mL, with an understood uncertainty of ± 0.1 mL. Figure 1 - Reading a Graduated Cylinder
uncertainty. Uncertainty is the limit of quan-tifiable measurement with confidence using measuring equipment. One method for determining the uncertainty of an analog measuring device is to utilize the scale provided on the equipment. For example, on a 10-mL graduated cylinder, there are gradu-ations (lines) every 0.1 mL.
