Crystallization Flashcards
What is crystallization
Process for organic solid where pure compounds are obtained after they’re made
The synthesized or made compound must be
Impure
Crude product is when the synthesized product
Is contaminated with by product of reaction or trace amounts of solvent
Melting point of crude will have whT type if range
Broad
If the compound is synthesized is known compound, it is easy to figure out
The solvent for recrystallization by searching the literature
If a new compound is chosen then
A problem solvent has to be chosen
In crystallization, solvents can be
Polar or nonpolar
Water is the most
Polar solvent
Alkanes are the most
Non polar solvents
The polarity of a solvent can be known from its
Dielectric constant.
The best solvent is one in which the compound is sparingly
Soluble at toom temp and increases infinite fold when heated
