The procedure states that the reaction is complete when bubbling ceases. What co
ID: 795155 • Letter: T
Question
The procedure states that the reaction is complete when bubbling ceases.
What could be the reason for this bubbling?
In your own words,what are the practical advantages of using a solid-
supported acid catalyst in this reaction?
In the purification process by recrystallization you will be using a mixed
solvent system involving ethanol and water. The goal is to dissolve the product in a minimal amount of hot ethanol and add hot drops of water just until the solution becomes cloudy, then cool. What do you think would happen if you added too much ethanol? What would happen if you added too much water? What would you do to correct the situation if you added too much of either ethanol or water?
Explanation / Answer
1) bubbling ends means what ever acids you have used for reaction with any carbonate base stop releasing CO2 from the reaction mixtuere , once it stops that the time all the acids are consumed so reaction finised.
2) solid support acids are easy to handle , it wont be harm ful like sulphuric acid and hydrochloric acids and it delivers proton slowly to complete the reaction.
3) if you add more ethanol longer concentration will decreases and the re crystalization process will take long time and if you add more water first think is it will prolong time to evaporate and what ever ethanol wil micible with water and your organic substrate will precepitate immediately
Finally if you add excess of both you have to wait long time to get evoporate and time waste only.
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