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

question 12

Multiple Choice

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.

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