Recrystallization process

  • Thread starter cloveryeah
  • Start date
  • #1
26
0
In the mix solvent of recrystallization, why it is better to add the second solvent dropwise instead of by one-portion?

i think...is it to improve the purification? but why?? is it increase the time of contacting the solvent so as to achieve a better dissolution??
 

Answers and Replies

  • #2
Bystander
Science Advisor
Homework Helper
Gold Member
5,268
1,323
improve the purification?
Yes. "Why How?" Do you really want everything dropping from solution at once?
 
  • #3
26
0
is it for the compound to have a better contact with the solvent?
 
  • #4
Bystander
Science Advisor
Homework Helper
Gold Member
5,268
1,323
better contact
"Dissolved" is dissolved. There are no degrees of dissolution.
recrystallization
What is the definition of the word "REcrystallization?"
 
  • #5
87
10
You want the compound to crystallize (=precipitate) slowly so that it forms big, pure crystals. You wanty the solubility of the compound to decrease gradually. "Crashing" the compound out of the solution by adding the second solvent all in one go achieves the opposite of this.
 

Related Threads on Recrystallization process

  • Last Post
Replies
1
Views
3K
Replies
3
Views
2K
  • Last Post
Replies
11
Views
1K
  • Last Post
Replies
8
Views
5K
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
1
Views
777
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
1
Views
2K
Top