The correct answer is option 4. Sedimentation.
The method that is NOT used to purify organic compounds is Sedimentation.
Sedimentation is a process where solid particles settle down at the bottom of a liquid due to gravity. This process is commonly used to separate solid particles from liquid mixtures in various industries but is not typically used as a primary method for purifying organic compounds.
On the other hand, sublimation, crystallization, and distillation are commonly employed techniques in organic chemistry for purifying compounds:
1. Sublimation: This method involves the direct transition of a solid substance to a gas phase without passing through the liquid phase. It is useful for purifying organic compounds that exhibit sublimation properties.
2. Crystallization: Crystallization involves the formation of solid crystals from a saturated solution of a compound. By controlling the conditions such as temperature and solvent composition, impurities can be excluded from the crystal lattice, leading to the purification of the compound.
3. Distillation: Distillation is a technique used to separate volatile components from non-volatile components in a mixture based on differences in their boiling points. It is commonly used for purifying liquid organic compounds by heating the mixture and collecting the vaporized fractions.
Overall, while sedimentation may be a separation technique, it is not typically used for purifying organic compounds. |
