Introductory Chemistry: A Foundation
9th Edition
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Donald J. DeCoste
Chapter2: Measurements And Calculations
Section: Chapter Questions
Problem 158AP
Related questions
Question
Figure 01: Different types of glassware for measuring liquid volume.
How to use a graduated cylinder?
1. Look straight across at the graduated cylinder to avoid parallax error (Figure
02). Read the bottom of the meniscus (the curved surface of the solution).
2. Important note about significant digits: A 100 mL graduated cylinder has
marks at 1-mL intervals; therefore, you should estimate the volume to the
nearest 0.1 mL. This is done by dividing the space between the 1-mL marks
into ten imaginary spaces and deciding which of those spaces the meniscus
is closest to. It’s OK if you aren’t sure—use your best judgment. The last digit
of any measurement is supposed to be uncertain or an estimate or best
guessed number.
3. If the meniscus is exactly on a line, you still record the volume to the nearest
0.1 mL. For example, if it’s right on the 27-mL line, record the volume as
“27.0 mL” to show that you read it carefully and the margin of error is 0.1
mL. Remember, trailing zeros after the decimal point are significant.
Figure 02: Reading the graduated Cylinder.
Transcribed Image Text:A. Volume from Graduated Cylinder
Materials
10-mL Graduated Cylinder
50-mL Graduated Cylinder
100-ml graduated Cylinder
Procedure
1. Test your volume measurement skills by correctly estimating the volume of
three provided unknown liquids in the lab. Be sure to use the correct number
of significant figures. Record your data in Data Table 01.
Transcribed Image Text:3. Estimate the volume of the object to the correct number of significant figures:
mL
25
20
10
ML
15
10
————
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