Worksheet: Schlenk Line Techniques

In this worksheet, we will practice describing the use of a Schlenk line or vacuum manifold, assessing the hazards of certain methods and common errors.

Q1:

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

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

Q2:

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

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

Q3:

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

  • ASuction of oil into the nitrogen line
  • BBreakage of a flask during attachment
  • CImplosion of the vacuum line
  • DImplosion of the nitrogen line
  • ECondensation of liquid oxygen

Q4:

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.
  • A3, 1, 2
  • B2, 1, 3
  • C2, 3, 1
  • D1, 3, 2
  • E3, 2, 1

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.
  • A2, 1, 3
  • B1, 2, 3
  • C2, 3, 1
  • D3, 2, 1
  • E1, 3, 2

Q6:

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
  • C2, 3, 1
  • D2, 1, 3
  • E3, 1, 2

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