Organic Analytical Chemistry: Lecture 4 Quiz
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Questions and Answers

What is the saponification method used for?

  • Determining the esters present in essential oils (correct)
  • Determining functional groups in organic compounds
  • Determining the percentage of water in organic compounds
  • Determining the molecular weight of organic compounds

    • What is the purpose of refluxing a sample with KOH dissolved in alcohol in the saponification method?

  • To form carboxylic acid and alcohol
  • To determine the percentage of alkali in the sample
  • To convert ester to alcohol and carboxylic acid (correct)
  • To determine the molecular weight of ester

    • What is the purpose of using a standard acid solution in the saponification method?

  • To neutralize the excess amount of alkali (correct)
  • To determine the percentage of ester in the sample
  • To determine the percentage of alkali in the sample
  • To determine the percentage of water in the sample

    • When can aqueous solution of NaOH or KOH be used for ester hydrolysis?

    <p>When esters are soluble in water and are easily saponified</p> Signup and view all the answers

    What can be determined if the molecular weight of ester is known in the saponification method?

    <p>The number of acetyl groups in a sample</p> Signup and view all the answers

    What is the saponification equivalent?

    <p>The ester weight in gram that reacts with 1 gram equivalent of a strong base</p> Signup and view all the answers

    What is used to estimate the amino group in organic compounds?

    <p>Acetylation method</p> Signup and view all the answers

    Which method involves the reaction of excess bromate-bromide solution with an amine sample in the presence of HCl?

    <p>Bromination method</p> Signup and view all the answers

    What is used for readily hydrolysed esters?

    <p>Absolute ethanol</p> Signup and view all the answers

    Which solvent can be used to increase the reaction rate in a solution of KOH?

    <p>High boiling point solvents</p> Signup and view all the answers

    What is the excess acetylating mixture hydrolyzed with in the acetylation method?

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

    Which method involves titrating a sample with standard acid to the neutral point, then adding bromophenol blue indicator and benzene to reach a green end point?

    <p>Double-indicator method</p> Signup and view all the answers

    Which solution is used for insoluble esters in water that are easily hydrolyzed?

    <p>Alcoholic solution of NaOH or KOH</p> Signup and view all the answers

    Which compound is reacted with excess bromate-bromide solution in the bromination method?

    <p>(C6H5-NH2)</p> Signup and view all the answers

    Which compound is used to replace the amino group in the acetylation method?

    <p>(C6H5-NH2)</p> Signup and view all the answers

    How can the % of amino group in a sample be calculated using the given formula V = volume of NaOH, N = conc. of NaOH, W = weight of sample, M.wt = M.wt of NH2?

    <p>$\frac{V \times N \times W}{M.wt}$</p> Signup and view all the answers

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