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Author Question: Suggest reasons for the following procedures when you are setting up a reaction assembly. (a) The ... (Read 52 times)

hbsimmons88

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on: Aug 23, 2018

Suggest reasons for the following procedures when you are setting up a reaction assembly.
  (a) The ground-glass joints are lightly greased.
  (b) Only a small amount of indicator desiccant is placed in a drying tube, instead of the tube
  being filled completely with this material.
  (c) Powdered drying agents are not used in drying tubes.



Question 2

A student at another university wants to duplicate a GC separation that you did in lab. What
  information about the instrument and column conditions should you send him?



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Anna

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Reply #1 on: Aug 23, 2018
Answer to Question 1

(a) The grease provides an air-tight seal and prevents the joints from becoming frozen
together.
(b) The indicating desiccant is expensive and just a little of it in the bulk ofanother desiccant
will tell you if the bulk desiccant is active or not.
(c) A powder will prevent the free flow of gas through the drying tube. This effectively closes
the reaction vessel to the atmosphere.



Answer to Question 2

The make of the GC, the column, the column temperature, and the flow rate of the carrier gas.
Detector and injector temperatures are also useful.



hbsimmons88

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Reply 2 on: Aug 23, 2018
Excellent

coreycathey

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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