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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.
12 cze 2008 · Uncertainties for Volumetric Glassware. Volumetric glassware, such as pipettes, burettes, and flasks, is required when performing any analytical determinations. This page provides a table of typical uncertainty values for the calibrated volume of such glassware.
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.
Significant Figures in Measurement. The numbers of measured quantities, unlike defined or directly counted quantities, are not exact. To measure the volume of liquid in a graduated cylinder, you should make a reading at the bottom of the meniscus, the lowest point on the curved surface of the liquid.
Figure \(\PageIndex{1}\): To measure the volume of liquid in this graduated cylinder, you must mentally subdivide the distance between the 21 and 22 mL marks into tenths of a milliliter, and then make a reading (estimate) at the bottom of the meniscus.
UNCERTAINTY IN MEASUREMENTS. PURPOSE: This lab study packet deals with various errors in experiments, avoidable (systematic) and unavoidable (random), and how they affect your experimental results. In many of the Chem 111 experiments you will be asked to give some indication to the validity of your results you report.
Reading the Volume from a 10-mL Graduated Cylinder. IMAGE. 10-mL graduated cylinder. Step 1: Determine the scale increment: To find the scale increment, subtract the values of any two adjacent labeled graduations and divide by the number of intervals between them.
