Question

1. For a mixture of pure hexane and pure dimethylformamide, the dimethylformamide layer will be found as:______.a. the top layer.b. the bottom layer.c. neither; the two solvents are miscible.d. cannot determine.2. To extract aniline (CeH5NH2) from a solution of chloroform, one would use:_____.a. aqueous HCI.b. aqueous NaOH.c. aqueous NaHCO3.d. either b or c would work.3. For mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as:____.a. the top layer.b. the bottom layer.c. neither; the two solvents are miscible.d. cannot determine.4. To extract benzyl alcohol (CeH5CH2OH) from a solution of chloroform, one would use:_____.a. aqueous HC b. aqueous NaOH.c. aqueous NH3.d. either B or C would work.5. A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found:______.a. only in the water layer.b. only in the diethyl ether layer.c. mostly in the water layer.d. mostly in the diethyl ether layer.

Answer 1

Answer:

1.  the bottom layer

2. aqueous HCI

3.  the top layer

4.aqueous NaOH

5. mostly in the diethyl ether layer

Explanation:

Pure dimethylformamide is considerably more polar than hexane hence thee two solutions will form two phases with the pure dimethylformamide as the bottom layer.

If we want to extract aniline from chloroform, HCl must be added in order to give a salt that can be extracted into the aqueous layer.

For a mixture of methylene chloride and diethyl ether, the diethyl ether layer will be found as the top layer since it is considerably less polar than  methylene chloride.

Benzyl alcohol can be extracted from a solution of chloroform by adding NaOH and extracting it into an aqueous layer.

A large partition coefficient for the extraction of naphthalene into diethyl ether from water means that naphthalene will be found mostly in the diethyl ether layer.