Titrations in Analytical Chemistry
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Questions and Answers

What is the purpose of titration methods in Analytical Chemistry?

  • To determine the volume of a known solution needed to react with the analyte (correct)
  • To react completely with the standard solution
  • To measure the quantity of analyte in a solution
  • To produce a chemical change in the analyte

    • What is the role of an Analyte (Titrand) in a titration?

  • It is a reagent of known concentration
  • It is a standard solution used for titration
  • It is a solution of unknown concentration but known volume (correct)
  • It is the reagent added from a burette

    • What is a characteristic of back-titration in titrations?

  • It determines the excess of standard solution used to consume an analyte (correct)
  • It is used when the rate of reaction between analyte and reagent is fast
  • It is performed at the equivalence point
  • It involves slowly adding a standard solution from a burette

    • What is the equivalence point in a titration?

    <p>The point when the added standard reagent equals the analyte</p> Signup and view all the answers

    What distinguishes an end point from an equivalence point in titrations?

    <p>An end point indicates when to stop titration, while an equivalence point is associated with chemical equivalence</p> Signup and view all the answers

    When is back-titration often required in titrations?

    <p>When the standard solution lacks stability</p> Signup and view all the answers

    In the Volhard method, why is AgCl precipitate filtered before undertaking the back titration?

    <p>To prevent interference in the subsequent reaction</p> Signup and view all the answers

    What is the purpose of using a strong acid solution in the Volhard method?

    <p>To prevent hydrolysis of the analyte</p> Signup and view all the answers

    Which type of indicator is commonly used in the Volhard method?

    <p>Specific indicator</p> Signup and view all the answers

    Why does the Mohr method not use for the determination of I-1?

    <p>Iodine forms a complex with Ag+1 that affects the titration endpoint</p> Signup and view all the answers

    What is the purpose of using specific indicators in redox titrations?

    <p>To provide a sharp color change at the equivalence point</p> Signup and view all the answers

    Why is the pH range of 6.5-9 crucial in the Mohr method?

    <p>To prevent hydrolysis of AgCl precipitate</p> Signup and view all the answers

    What is the purpose of using an indicator in a titration process?

    <p>To produce an observable physical change at or near the equivalence point</p> Signup and view all the answers

    Why are weak acids and bases not used as standard reagents in acid-base titrations?

    <p>They react incompletely with analytes</p> Signup and view all the answers

    In a strong acid + weak base titration, what is the pH at the equivalence point?

    <p>pH &lt; 7</p> Signup and view all the answers

    What type of complex formation occurs in complexometric titrations?

    <p>Formation of a complex between metal ions and ligands</p> Signup and view all the answers

    What is the role of an ion or molecule that forms a covalent bond with a metal atom by donating a pair of electrons?

    <p>Complexing agent</p> Signup and view all the answers

    Why is EDTA considered a widely used complexometric titrant?

    <p>It forms a weak complex with metal ions</p> Signup and view all the answers

    What type of ligand has two groups available for covalent bonding?

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

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