1. In step one, why do you weigh the solid after powdering it rather than before
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Question
1. In step one, why do you weigh the solid after powdering it rather than before?
2. In what form is the organic acid after it is extracted into an aqueous phase?
3. In what form is the organic base after it is extracted into an aqueous phase?
4. In this experiment, was the organic phase the upper or lower one in the saparatory funnel?
What determines its relative position?
6. Why do you dry the organic phase before distilling the solvent?
7. Why do you remove the stopper from the separtory funnel before attempting to the drain the bottom layer?
8. Draw a flow diagram for this experiment. Indicate which phase contains each of the compounds in the mixture.
10. Why is it essential to carefully separate the layers during an extraction? What would happen if the layers were not separated completely?
11. You are given an impure solid that contains 70% of the desired product. After extracting 15 g of the material, you recover 6 g of the pure compound. What is the correct recovery?
Explanation / Answer
1. Because you can lose some solid during the process of powdering.
2)it is deprotonated when is in the aquous layer.
3) it is protonated when is in the aquous layer.
4) what determine its relative position is the density of the liquid. The less dense will float over the more dense.
6) to prevent uncontrolled boiling during distillation and to avoid any side reaction.
7) To avoid over presion,so avoid accidents.
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