CHM 2045 Lecture Notes - Lecture 1: Paper Towel, Graduated Cylinder, Purified Water
8 Oct 2017
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In accord with the 10% rule, read the meniscus levels of the liquids in the graduated cylinders and buret that are on display and labeled as known . Beware of parallax error and multiple meniscus images. Compare your meniscus readings to the given meniscus readings. Knowns you probably know how to read meniscus levels correctly and may proceed to the next. If, however, you do not agree with the known readings, ask your instructor for assistance before continuing. Read the meniscus levels in the graduated cylinders and buret labeled as unknown . Be sure to apply the 10% rule and to include correct units on each entry. Estimation of the drop volume of 1 ml water. Add water using a dropping pipette to a 10-ml graduated cylinder until the meniscus level coincides with the 1-ml calibration mark. Now, count drops added, and add more water dropwise as the meniscus level rises and becomes coincident with the 2-ml mark.
