PHARM206 Lecture 7: Complex-Formation Titration
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Questions and Answers

What is the primary purpose of using metal ion indicators in complexometric titration?

  • To indicate the presence of metal ions
  • To determine the equivalence point (correct)
  • To detect the formation of metal-EDTA complex
  • To measure the pH of the solution

    • What is the formation constant (Kf) for the reaction between metal ion and metal-in indicator?

  • 20
  • 25
  • 10
  • 18 (correct)

    • What is the color of the solution at the end point of a complexometric titration?

  • Red
  • Blue
  • Green
  • Colourless (correct)

    • Why is Erichrome Black T (EBT) unstable in solution?

    <p>Due to its high reactivity</p> Signup and view all the answers

    What is the purpose of complexometric titration in the food industry?

    <p>To determine the calcium content in cornflakes</p> Signup and view all the answers

    What is the significance of the equivalence point in a complexometric titration?

    <p>It indicates the completion of the reaction</p> Signup and view all the answers

    What is the characteristic of the phenolic groups in Erichrome Black T?

    <p>They partially dissociate in water</p> Signup and view all the answers

    What is the primary advantage of complexometric titration?

    <p>It can be used for nearly all metals</p> Signup and view all the answers

    What is the role of EDTA in complexometric titration?

    <p>It acts as a complexing agent</p> Signup and view all the answers

    What is the significance of freshly preparing Erichrome Black T solutions?

    <p>It is required to obtain accurate results</p> Signup and view all the answers

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