On a lab quiz,a student listed the steps to properly use a pipet.Which step is incorrect?
A)Use a rubber bulb to twice pull up a volume of liquid past the calibration mark and discard the contents into a waste container.
B)Pull up a third volume past the calibration mark and quickly replace the bulb with the index finger.
C)Touch the tip of the pipet to the side of a beaker and use the index finger to drain the liquid until the meniscus reaches the center of the calibration mark.
D)Transfer the pipet to the receiving vessel,touch the tip of the pipet to the side of the vessel,and allow the pipet to drain by gravity.
E)Use the rubber bulb to blow any remaining liquid from the pipet.

Question

Quizplus · Accepted Answer

Using a rubber bulb to blow any remaining liquid from the pipet is incorrect because pipets are designed to deliver the correct volume of liquid through gravity alone, and blowing can lead to delivering more liquid than intended.

On a Lab Quiz,a Student Listed the Steps to Properly