![]() Our lab is equipped with many different graduated cylinders, and the number of significant digits they give you depends on the exact graduated cylinder you are using and the volume you are measuring. Graduated cylinders are the most flexible tool for measuring volume.Our lab is equipped with burets that measure to the nearest 0.01 mL, so a volume greater than 1 mL will have 3 significant digits, and a volume greater than 10 mL will have 4 significant digits. You always estimate one more digit than you can read from the lines and estimate to 1/5th between lines. Burets are very precise tools for measuring volume.The number of significant digits you get from a micropipette is printed on the pipette for your reference, but it is usually about 4 significant digits. Micropipettes are very precise tools for measuring extremely small volumes (less than one milliliter).The precision is usually printed on the flask for reference. For example, a precision 1 liter volumetric flask filled exactly to the line etched on the neck contains 1.0000 L, which is 5 significant digits. Volumetric flasks are extremely precise tools for measuring volume and often give you 4 or more significant digits, depending on the size of the volumetric flask.That is the maximum mass for one of our balances. Higher masses give you more significant digits until you reach the capacity of the balance. For example, 0.5012 g of a substance has 4 significant digits. Mass – analytical balances generally give many significant digits, particularly when weighing 0.1 g or more, you get 4, 5, 6, or 7 significant digits.Background Significant digits from common measurements Although your results should be similar every time, the number of significant digits you get will vary depending on the uncertainty associated with the measurement techniques. In this lab, you will be measuring the density of water using a variety of tools. When your measurement has a limited number of digits, your subsequent calculations will also have a limited number of digits. Rules about significant figures may seem arbitrary from a theoretical standpoint, but in the laboratory you will see that they allow you to determine the precision of your measurements and calculations. Learning goals: follow instructions to complete a chemistry experiment, collect and analyze experimental data, explain likely sources of experimental error, w ork collaboratively with a lab partner. ![]()
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