4. Explain why polar CHCly/CH3OH solvent than in acetone. subst or ionic substan

Question

4. Explain why polar CHCly/CH3OH solvent than in acetone. subst or ionic substances, such as phospholipids, would be more soluble in a 1:1, the alumina column in the fraction as observed. Describe a chemical procedure that could be used to estimate the degree of unsaturation in the fatty acids isolated at the end of this procedure. Give the formulas of all the products which would be obtained if a sample of the PC illustrated on page 1 of this exercise were dissolved in a sodium hydroxide/ethanol solution, sealed in an ampoule, and heated in the oven for several hours. Be sure to indicate the correct charges.

Explanation / Answer

1. Polar compounds dissolve in polar solvents whereas non-polar or less polar compounds dissolve in non-polar solvent. PC is a hydrophobic-hydrophilic molecule and therefore it dissolves in organic less polar/organic more polar CHCl3/CH3OH solvent preferably over low polarity acetone solvent.

2. Most of the PC does not have any strong interaction with the polar alumina column and thus was elued in the fraction described above.

3. Degree of unsaturation can be tested by adding Br2 solution to fatty acid. The moles of Br2 consumed is equal to the number of unsaturation in the system. 1 double bond takes 1 Br2.

4. We would get the products, 1 mole of oleic acid, 1 mole of palmitic acid, 1 mole of choline, 1 mole of NaH2PO4 upon reaction of given PC with NaOH.

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