Question

points possible: 1.00
identify effective techniques for accurate pipet use.
select all that apply.
select one or more:
measure liquid by aligning the meniscus with the volume line.
do not let liquid enter the pipet bulb or pump.
use the pipet bulb to force the last drop out of the tip.
leave any air bubbles in a pipet that occur after drawing up liquid.

Explanation:

To determine effective pipet use techniques:

• Aligning the meniscus with the volume line ensures accurate measurement (correct).
• Preventing liquid from entering the bulb/pump avoids contamination and damage (correct).
• Forcing the last drop out with the bulb is incorrect as pipets are calibrated to leave the last drop (so this is wrong).
• Leaving air bubbles is incorrect as they affect volume accuracy (so this is wrong).

Answer:

A. Measure liquid by aligning the meniscus with the volume line.
B. Do not let liquid enter the pipet bulb or pump.