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Lesson: Schlenk Line Techniques

Worksheet • 6 Questions

Q1:

When working with a Schlenk line, which of the following is the least likely hazard?

  • AImplosion of the nitrogen line
  • BBreakage of a flask during attachment
  • CSuction of oil into the nitrogen line
  • DCondensation of liquid oxygen
  • EImplosion of the vacuum line

Q2:

When shutting down a vacuum line, in which order should the following actions be performed?

  1. Turn off the vacuum pump.
  2. Remove the Dewar of liquid nitrogen.
  3. Vent the vacuum line.
  • A1, 2, 3
  • B3, 2, 1
  • C3, 1, 2
  • D2, 1, 3
  • E2, 3, 1

Q3:

When working with a Schlenk line, which of the following actions is the least problematic?

  • AOpening a flask to air before closing the tap connecting it to the nitrogen line
  • BOpening a flask to air before closing the tap connecting it to the vacuum line
  • CRaising the Dewar of liquid nitrogen up to the joint of the cold trap
  • DHolding a flask by the base when attaching it to the Schlenk line
  • EOpening the tap between the nitrogen line and a flask under vacuum

Q4:

When working with a Schlenk line, which of the following actions is the least problematic?

  • APerforming a vacuum-backfill cycle on an empty flask without a cold trap
  • BAttaching a septum to a dry solvent bottle without a nitrogen flow
  • CNot greasing the joint of the cold trap
  • DClosing all connections to a heated reaction flask
  • EOpening the tap between the vacuum line and the receiving flask during cannulation of a solvent

Q5:

When setting up a vacuum line, in which order should the following actions be performed?

  1. Raise the Dewar of liquid nitrogen to surround the cold trap.
  2. Turn on the vacuum pump.
  3. Open the line to the cold trap.
  • A3, 2, 1
  • B2, 3, 1
  • C1, 2, 3
  • D2, 1, 3
  • E1, 3, 2

Q6:

When setting up a nitrogen line, in which order should the following actions be performed?

  1. Open the tap to the oil bubbler.
  2. Ensure the taps are properly greased.
  3. Turn on the nitrogen flow.
  • A2, 1, 3
  • B3, 2, 1
  • C1, 3, 2
  • D3, 1, 2
  • E2, 3, 1
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