Practice Quiz 3 1) A student uses ether to extract an organic compound from the

Question

Practice Quiz 3 1) A student uses ether to extract an organic compound from the aqueous solution in a separatory funnel. Before evaporating the ether to isolate the solid organic compound, the student adds anhydrous sodium sulfate. What is the molecular formula of sodium sulfate? What is the purpose of adding it and how is it separated from the organic layer before the ether is evaporated? 2) After a reaction, traces of the starting material diphenylamine were left in the organic layer. Would an aqueous solution of sodium bicarbonate be effective in removing traces of diphenylamine from the organic layer? Explain your answer by showing a chemical reaction between sodium bicarbonate and diphenylamine. 3) A crude organic compound dissolved in diethyl ether (d 0.715 g/mL) is poured into a separatory funnel. Deionized water (d-1.000 g/m) is added to the separatory funnel. Which layer contains the product?

Explanation / Answer

1a) Molecular formula of Sodium Sulfate is Na2SO4.and it's chemical structure is,

1b) Purpose of adding Anhydrous sodium sulfate to isolate solid organic compound.

The Na2SO4 removes water from the organic extract.
If you do not remove the water that is dissolved in the solvent it will end up in the extract which will give a higher value for the grease content than the true value.

Removal of water from ether is according to following equation.

Na2SO4.+ n H2O -------------> Na2SO4 (H2O)n.

And this is the way Sodium sulfate removed away from ether

=============XXXXXXXXXXXXX=================

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.