chemistry unit 5

[bilquees]

what is the difference b/w solvent extraction and salting out?

 

[V Kandiah]

what is the difference b/w solvent extraction and salting out?

When aniline (aminobenzene) is steam distilled during its preparation from Nitrobenzene the distillate contains water and aniline. Aniline is soluble in water. So you transfer the distillate to a separating funnel and add ether. Shake (carefully etc etc). Aniline is more soluble in ether so the oranic layer has more aniline than the aqueous layer. Separate and distill off ether to get aniline. This is solvent extraction. You are extracting the aniline using a solvent because it is more soluble in the solvent than in water.

Salting out is similar but different. You have an organic substance dissolved in water. You add salt (NaCl) which is more soluble. So the organic product separates out ie you are salting out the organic substance literally.

I haven't seen the Q but this is a long winded answer.