Titrations in Analytical Chemistry
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Questions and Answers

What is the major difference between the equivalence point and the end point in a titration?

  • Color change
  • Chemical reaction
  • Volume difference (correct)
  • Physical change
  • Why are weak acids and bases never used as standard reagents in acid-base titrations?

  • They are colorless
  • They react incompletely with analytes (correct)
  • They are too stable
  • They are too reactive
  • Why are HCl and NaOH classified as secondary standard solutions?

  • They are less pure than primary standards (correct)
  • They are highly stable
  • They react selectively with analytes
  • They react completely with analytes
  • In complexometric titration, what forms a covalent bond with a metal atom to produce a complex?

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

    What type of acid-base titration results in a solution with pH greater than 7 at the equivalence point?

    <p>Weak acid + strong base</p> Signup and view all the answers

    Why is EDTA commonly used as a complexometric titrant?

    <p>It forms a colored 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

    In precipitation titration, what method is based on the formation of slightly soluble precipitates?

    <p>Precipitation titration</p> Signup and view all the answers

    Which method of detection of endpoint utilizes adsorption indicators?

    <p>Fajans Method</p> Signup and view all the answers

    What does an acid-base indicator do in a titration?

    <p>Undergoes color change near the equivalence point</p> Signup and view all the answers

    Why is AgCl ppt. in the Volhard method filtered before undertaking the back titration?

    <p>To prevent interference with the back titration</p> Signup and view all the answers

    In the Volhard method, why must the solution be a strong acid?

    <p>To avoid side reactions involving hydroxide ions</p> Signup and view all the answers

    Why is the pH range of Mohr method titration specified to be between 6.5-9?

    <p>To avoid unwanted precipitate formation</p> Signup and view all the answers

    Why is the Volhard method rarely used nowadays?

    <p>It is time-consuming due to multiple steps involved</p> Signup and view all the answers

    Why does the first drop of excess Ag+1 react with Fluorescein indicator in the Volhard method?

    <p>To indicate the endpoint of the titration</p> Signup and view all the answers

    Why does the Mohr method not use CrO4-2 for titrations involving Ag+1?

    <p>CrO4-2 forms a complex that interferes with endpoint detection</p> Signup and view all the answers

    Why does the Volhard method not use for determination of SCN-1?

    <p>Scn-1 forms a colored complex that affects endpoint detection</p> Signup and view all the answers

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

    <p>To prevent side reactions involving hydroxide ions</p> Signup and view all the answers

    Why do types of redox indicators differ based on their oxidized and reduced forms' colors?

    <p>To provide visual cues for endpoint detection during titrations.</p> Signup and view all the answers

    In oxidation-reduction reactions, what characterizes an oxidizing agent?

    <p>Substance that accepts electrons and gets oxidized.</p> Signup and view all the answers

    What is the purpose of titration methods in Analytical Chemistry?

    <p>To measure the quantity of a reagent needed to react with the analyte completely</p> Signup and view all the answers

    What is the function of a standard solution in volumetric titrations?

    <p>To be a solution of known concentration</p> Signup and view all the answers

    When is back-titration used in titration methods?

    <p>When stability of the standard solution is a concern</p> Signup and view all the answers

    What is the Equivalence point in a titration?

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

    Which statement best describes an Analyte in titration methods?

    <p>It's a solution of unknown concentration but known volume</p> Signup and view all the answers

    In a volumetric titration, why is it important to measure the volume of the standard solution needed for complete reaction?

    <p>To know how much reagent is needed for complete reaction</p> Signup and view all the answers

    What does the End Point indicate in a titration?

    <p>The completion of the titration reaction</p> Signup and view all the answers

    How is back-titration different from direct titration?

    <p>In back-titration, an excess of one standard solution reacts with an analyte first.</p> Signup and view all the answers

    What is the role of the burette in volumetric titrations?

    <p>To deliver controlled amounts of standard solution to the analyte.</p> Signup and view all the answers

    When is a back-titration preferred over direct titration?

    <p>When there are issues with slow reactions or unstable standard solutions.</p> Signup and view all the answers

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