Question

Started dissolving mixture with diethyl ether. And shook 3M HCL in sep funnel. Collected.

Now:

1) You added NaOH to organic phase collected in problem 2 to extract another compound,

Which compound was extracted in NaOH solution? Justify with chemical equation

2) to the aqueous phase you added HCL solution until it’s ph was less than 7. What happens if it’s ph is 7 or above?

3) when you acidified the solution by adding HCL, a white precipitate was produced. What’s it made of? Justify with equation

from the given mixture by solvent extraction. он CI NH2 Benzoic acid Naphthalene p-Chloroaniline

Answer 1

On treating with Hcl forms salt with amine which then goes into aqueous phase and Benzoic acid and Napthalene goes into organic layer. Then add NaOh to organic, benzoic acid forms salt and goes down onto aqueous phase and Napthalene goes into organic layer, on dried off the ether gives pure Napthalene.

Then add Hcl to aqurous layer untill it reaches pH<7 to regenerate the Benzoic acid and then add Na2SO4 to absorb moisture remains in the compound and finally filteration gives pure Benzoic acid.

Add NaOH to amine Salt to regenerate the amine and then add Na2SO4 to absorb moisture and filter off gives pure amine.

H2- oYgani o yey cJ 0 CA Ads NaoH byganc cx 0r30 +10 fr ethes 0 Pure Naptm)ex NaSo