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?

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

Q2:

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

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

Q3:

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

  • AImplosion of the vacuum line
  • BSuction of oil into the nitrogen line
  • CCondensation of liquid oxygen
  • DImplosion of the nitrogen line
  • EBreakage of a flask during attachment

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.
  • A2, 3, 1
  • B1, 3, 2
  • C3, 1, 2
  • D2, 1, 3
  • 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.
  • A1, 3, 2
  • B1, 2, 3
  • C2, 1, 3
  • D3, 2, 1
  • E2, 3, 1

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.
  • A2, 3, 1
  • B3, 1, 2
  • C2, 1, 3
  • D1, 2, 3
  • E3, 2, 1

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