& Medicinal Org.Chem.Lab S.Y.‘23 - ‘24: John Patrick DT.Ramos Exercise 1 - 5
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Questions and Answers

What technique is essential for isolating and purifying organic substances?

  • Crystallization
  • Extraction (correct)
  • Filtration
  • Distillation
  • Why is a water wash necessary in the extraction process?

  • To enhance the solubility of caffeine
  • To purify the organic compound (correct)
  • To increase the polarity of the solvent
  • To remove organic impurities
  • Which of the following solvents is commonly used for extracting caffeine from tea?

  • Dichloromethane (correct)
  • Diethyl ether
  • Hexane
  • Ethanol
  • What is the purpose of adding a drop of water to identify the organic layer?

    <p>Break any emulsion formed</p> Signup and view all the answers

    How can an emulsion be prevented during the shaking process?

    <p>Use a glass rod for gentle stirring</p> Signup and view all the answers

    Which physicochemical test can be used to identify the presence of phenolic compounds like vanillin?

    <p>Ferric chloride test</p> Signup and view all the answers

    Which solvent is suitable for extracting a nonpolar organic compound from an aqueous solution?

    <p>Hexane</p> Signup and view all the answers

    In separation techniques, what plays an important role in extracting a solute from one solvent into another?

    <p>Difference in polarity between solvents</p> Signup and view all the answers

    'Washing' operation in extraction involves adding what to the reaction mixture?

    <p>&quot;Water and an immiscible organic solvent&quot;</p> Signup and view all the answers

    'Stopping the funnel and shaking it' in extraction aims to achieve what outcome?

    <p>'Allow the layers to separate'</p> Signup and view all the answers

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