You have dissolved 2 g of a mixture of benzoic acid and naphthalene in 30 ml of

Question

You have dissolved 2 g of a mixture of benzoic acid and naphthalene in 30 ml of diethyl ether and started the extraction procedure.

Match the question with an appropriate answer from the drop-box. Before answering the questions below get the data about density of the solvents you use.

You transferred the solution of benzoic acid and naphthalene in diethyl ether to the separatory funnel and added on top15 ml of 2.5 M NaOH solution. Where you would find the aqueous solution, at the top or at the bottom of the separatory funnel?

You transferred prepared solution of benzoic acid and naphthalene in diethyl ether to the separatory funnel and added on top15 ml of 2.5 M NaOH solution and you shook the separatory funnel. Where you would find the aqueous solution, at the top or at the bottom of the separatory funnel?

After completing the extraction the procedure in the textbook recommends you to transfer the organic solution into a clean Erlenmeyer flask. What is the composition of organic solution?

After completing the extraction the procedure in the textbook recommends you to transfer the aqueous layer into a clean Erlenmeyer flask. What is the composition of aqueous layer?

Possible answers for all above questions:

1.The aqueous layer is a solution of benzoic acid in water

2. The organic solution is a solution of sodium benxoate in 2.5M aqueous solution

3. The aqueous layer is a solution of sodium benzoate and excess of sodium hydroxide in water

4. Aqueous solution will be found at the bottom of the separatory funnel

5. The organic solution is a solution of aphthalene in diethyl ether

6.The aqueous layer is a solution of sodium benzoate in water

7.The organic solution is a solution of benzoic acid in diethyl ether

8. The organic solution is a solution of naphthalene an benzoic acid in diethyl ether

You transferred the solution of benzoic acid and naphthalene in diethyl ether to the separatory funnel and added on top15 ml of 2.5 M NaOH solution. Where you would find the aqueous solution, at the top or at the bottom of the separatory funnel?

You transferred prepared solution of benzoic acid and naphthalene in diethyl ether to the separatory funnel and added on top15 ml of 2.5 M NaOH solution and you shook the separatory funnel. Where you would find the aqueous solution, at the top or at the bottom of the separatory funnel?

After completing the extraction the procedure in the textbook recommends you to transfer the organic solution into a clean Erlenmeyer flask. What is the composition of organic solution?

After completing the extraction the procedure in the textbook recommends you to transfer the aqueous layer into a clean Erlenmeyer flask. What is the composition of aqueous layer?

Possible answers for all above questions:

1.The aqueous layer is a solution of benzoic acid in water

2. The organic solution is a solution of sodium benxoate in 2.5M aqueous solution

3. The aqueous layer is a solution of sodium benzoate and excess of sodium hydroxide in water

4. Aqueous solution will be found at the bottom of the separatory funnel

5. The organic solution is a solution of aphthalene in diethyl ether

6.The aqueous layer is a solution of sodium benzoate in water

7.The organic solution is a solution of benzoic acid in diethyl ether

8. The organic solution is a solution of naphthalene an benzoic acid in diethyl ether

Explanation / Answer

1. Where would you find the aqueous solution, at the top or at the bottom of the separatory funnel?

Solution: The Aqueous solution will be found at the bottom of the separatory funnel.

Reason: water is denser than diethyl ether so it will settle at the bottom of the separating funnel. ( density of water = 1g/ml and density of diethyl ether = 0.713g/ml)

2. What is the composition of the organic solution?

Solution: The organic solution is a solution of naphthalene in diethyl ether.

Reason: since naphthalene is an aromatic hydrocarbon which is nonpolar in nature, therefore, it dissolves in a nonpolar solvent such as diethyl ether.

3. What is the composition of an aqueous layer?

Solution: The aqueous layer is a solution of sodium benzoate in water.

Reason: sodium hydroxide will remove the acidic proton of the carboxylic acid group in benzoic acid and the benzoic acid will become sodium benzoate which is a charged species and therefore is soluble in water.

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