A student sets up a reaction under reflux using the glassware shown, in addition to other apparatus. A solution is prepared in dry solvent extracted from a Schlenk flask and added dropwise to a second solution under a nitrogen atmosphere.
To which position should the reflux condenser be attached?
To which position should the dropping funnel be attached?
Which positions should be secured with a clamp?
Nitrogen is supplied via a Schlenk line. How many outlets of the Schlenk line must be used when assembling the apparatus and reaction mixture?
When a reaction is performed under reflux, cooling water flows into the reflux condenser via rubber tubes. Which of the following is not a disadvantage of using very long tubes to connect the condenser to the tap and sink?
Which of the following pieces of apparatus is not used when heating a reaction mixture under reflux?
A researcher wishes to heat a reaction mixture in a nitrogen atmosphere overnight. Which heating method is the most appropriate?
Which of the following is not a reason for the slow addition of a reagent via a dropping funnel?
When a reaction is performed under reflux, cooling water flows into the reflux condenser via rubber tubes. What is the main disadvantage of using very short tubes to connect the condenser to the tap and sink?
Which of the following is not an advantage of an air-cooled reflux condenser as compared to a condenser using a water flow?
A student performs a reaction using a water bath and a loosely clamped reflux condenser, as shown.
In what way has the apparatus been incorrectly assembled?
What change should be made to the apparatus if the reaction is to be run overnight?
Which of the following is not an advantage of using a low flow rate in the water condenser?
The reaction is performed under nitrogen to lower the concentration of air in the reaction solvent. What change could be made to the apparatus to further protect reactants from unwanted reactions with air?
When heating a reaction mixture under reflux, which of the following steps is not required?