Grinard Reactions: 1. Why does your glassware, needles, syringes, and vials used
ID: 482318 • Letter: G
Question
Grinard Reactions:
1. Why does your glassware, needles, syringes, and vials used in this reaction need to be dry? (2 points)
2. The dry diethyl ether will be stored in a bottle equipped with a septum (a rubber seal, that doesn’t allow air and moister to penetrate). You have to push a needle through the septum in order to draw the liquid in the syringe. What do you do, if you can’t reach the liquid surface with the needle? (2 point)
Choose the two correct answers!
a. Remove the septum very quick, draw the liquid in the needle and put the septum back.
b. Hold the bottle in an angle so the liquid layer is higher and can be reached with the needle without pushing the bigger part of the needle through the septum.
c. Squeeze the needle further, so the surface would be reached even if the bigger part of the needle has to push through the septum and the septum will be destroyed.
d. If the liquid layer is not high enough to reach it with the needle even after holding the bottle in an angel, I will ask the instructor or learning assistant to place a full bottle of dry diethyl ether in the hood.
Explanation / Answer
2. The correct answers are b and d.
Explanation: The purpose of storing the diethyl ether in a bottle equipped with septum is to keep it dry and moisture free. If the septum is removed or needle is squeezed further with bigger part of the needle damaging the septum. The purpose of putting septum will be lost. Hence, a and c are ruled out and the correct answer is b and d.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.