Questions about lipids and lipid components. The following questions relate to j
ID: 1044687 • Letter: Q
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Questions about lipids and lipid components. The following questions relate to just palmitic acid. 1 - In which solvent should palmitic acid be most soluble? Explain your answer 2- In which solvent should palmitic acid be least soluble? Explain your answer. 3- How many drops of iodine were required before the sample stayed brown? What does this indicate about palmitic acid? 4 - Did any samples require more drops of iodine before remaining brown? If so, name one and provide a reason why 5- What would be the products of alkaline hydrolysis of palmitic acid? 6- Does palmitic acid produce acrolein when heated in the presence of potassium acid sulfate? Explain your answerExplanation / Answer
1. Palmitic acid seems to be non-polar in nature due to its long hydrocarbon chain. This long chain also contributes to its hydrophobicity. As the rule states, 'like dissolves like', the palmitic acid will be very much soluble in non-polar solvents like CCl4, benzene.
Since it also has a carboxylic acid group, it would be soluble in alcohol and less polar solvents like amyl acetate.
2. Palmitic acid seems to be non-polar in nature due to its long hydrocarbon chain. This long chain also contributes to its hydrophobicity. Thus it would be least soluble in a polar solvent like water.
5. An alkaline hydrolysis would give palmitate ion which is basically soap after charge neutralization. This process is generally called saponification.
6. Yes, glycerol or its fatty acid ester when heated in potassium acid sulfate undergoes dehydrogenation and gives acrolein.
7. Only non-saponifiable lipids and steroids give the Sallkowski test. Thus palmitic acid won't give this test.
8. That test id also for steroids. Palmitic acid won't give this.
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