How to use a pipette.
You have access to two variable volume pipettes, a 5-50µl pipette and a 50-250µl pipette.
You need to precisely dispense 255µl. Select the best way to dispense this volume.

Question

How to use a pipette. 
 You have access to two variable volume pipettes, a 5-50µl pipette and a 50-250µl pipette. 
 You need to precisely dispense 255µl. Select the best way to dispense this volume.

Answer

Use only the 5-50µl pipette, and dispense 50µl five times. Then adjust the pipette to 5µ and dispense the final 5µl. The 5-50µl pipette will be more accurate at pipetting than the 50-250µl pipette.

Answer

Use the 50-250µl pipette and set it to 127.5µl and dispense 127.5µl twice.

Answer

It is not possible to dispense 255µl with the pipettes you have available.

Answer

Use the 50-250µl pipette and set it to 250µl to dispense the first volume, then use the 5-50µl pipette and set it to 5µl to dispense the second volume to give a total of 255µ.

Answer

Use the 50-250µl pipette and set it to 255µl. The pipettes are able to be set beyond the set range, and dispensing a single volume will give the most accurate volume.

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How to use a pipette. You have access to two variable volume pipettes, a 5-50µ...

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