Chemistry Sample Preparation and Determination Quiz
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Questions and Answers

What is the purpose of adding pulverised sodium chloride to the sample?

  • To help in the extraction process (correct)
  • To neutralize the sample
  • To precipitate certain compounds
  • To increase the density of the solution

    • Why is it important to avoid the formation of emulsion during extraction?

  • Emulsion hinders the extraction process
  • Emulsion makes the solution difficult to filter
  • Emulsion leads to inaccurate determination (correct)
  • Emulsion causes loss of sample

    • After washing the chloroform extract free from mineral acid, what should be done next?

  • Heat the mixture to remove excess water
  • Dry the chloroform layer over anhydrous sodium sulphate (correct)
  • Discard the chloroform extract
  • Add more mineral acid

    • What should be done after draining off the water phase from the chloroform extract?

    <p>Dry the chloroform layer over anhydrous sodium sulphate</p> Signup and view all the answers

    What is the purpose of extracting with multiple portions of chloroform?

    <p>To ensure complete extraction of compounds</p> Signup and view all the answers

    Why is it important to let the sample stand for 2 hours before filtering?

    <p>To allow time for precipitation to occur</p> Signup and view all the answers

    What is the purpose of neutralizing to litmus paper using hydrochloric acid during determination?

    <p>To adjust the pH of the solution</p> Signup and view all the answers

    What is the primary issue with the text provided?

    <p>The text contains a lot of irrelevant repetition.</p> Signup and view all the answers

    Why is it important to avoid repetitive content in writing?

    <p>To keep readers engaged and interested.</p> Signup and view all the answers

    What effect does excessive repetition have on the readability of a text?

    <p>It makes the text monotonous and tiresome to read.</p> Signup and view all the answers

    Which aspect of writing is negatively impacted by repeated content?

    <p>Clarity and conciseness</p> Signup and view all the answers

    How can writers improve the quality of their writing in light of the text's issue?

    <p>By introducing new and relevant information.</p> Signup and view all the answers

    What is the purpose of washing the chloroform extract free from mineral acid?

    <p>To remove impurities that may interfere with subsequent steps</p> Signup and view all the answers

    Why is it important to let the sample stand for 2 hours before filtering?

    <p>To allow any remaining water to evaporate</p> Signup and view all the answers

    What happens if an emulsion forms during extraction?

    <p>It may lead to loss of product and reduced efficiency</p> Signup and view all the answers

    Why is it necessary to extract with multiple portions of chloroform?

    <p>To ensure complete extraction of the compound from the sample</p> Signup and view all the answers

    What is the purpose of adding pulverized sodium chloride to the sample?

    <p>To decrease solubility of impurities</p> Signup and view all the answers

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