Analytical Chemistry: Titration Methods for Metal Ions
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Questions and Answers

What is the characteristic of the endpoint in Fajan's method?

  • Reddish-brown color
  • Colorless chloroform layer
  • White precipitate with AgCl (correct)
  • Red precipitate of ferric thiocyanate

What is the name of the method that involves the formation of a white precipitate with AgCl at the start of the reaction?

  • Fajan's method (correct)
  • Volhard method
  • Direct Titration
  • Mohr's method

Who is the scientist after whom Fajan's method is named?

  • Jacob Volhard
  • Kazimiers Ferric
  • Kazimiers Mohr
  • Kazimiers Fajans (correct)

What is the type of reaction that occurs in Fajan's method?

<p>Precipitation reaction (C)</p> Signup and view all the answers

What is the purpose of Fajan's method?

<p>To determine the purity of NaCl (A)</p> Signup and view all the answers

What is the indicator used in Fajan's method?

<p>Dichlorofluorescein (DCF) (C)</p> Signup and view all the answers

What is the purpose of adding 20g of NaCl in the sodium fluoride determination?

<p>To repress ionization of NaF (C)</p> Signup and view all the answers

What is the indicator used in the titration of sodium fluoride with ferric chloride?

<p>Potassium thiocyanate (C)</p> Signup and view all the answers

What is the reaction that occurs between NaF and FeCl3?

<p>NaF + FeCl3 → FeF63- (A)</p> Signup and view all the answers

What is the purpose of using ascorbic acid, citrates, and tartrates in the determination of zinc?

<p>To mask the interference of Co, Ni, and Cu (C)</p> Signup and view all the answers

What is the advantage of using EDTA in the determination of zinc?

<p>It forms a stable complex with zinc ions (A)</p> Signup and view all the answers

What is the name of the titration method used to determine the iodine content in iodine-containing radiocontrast medium?

<p>Fajans Titration (D)</p> Signup and view all the answers

What is the purpose of adding nitrobenzene in the Fajans titration method?

<p>To form a film over precipitated AgCl particles (B)</p> Signup and view all the answers

What is the USP requirement for the iodine content in iodine-containing radiocontrast medium?

<p>99.0% - 100.5% (C)</p> Signup and view all the answers

What is the reaction between 0.1N silver nitrate and iodine in the Fajans titration method?

<p>Precipitation reaction (D)</p> Signup and view all the answers

What is the purpose of adding ferric ammonium nitrate in the Fajans titration method?

<p>To prevent the precipitation of silver sulfate (B)</p> Signup and view all the answers

What is the endpoint of the Fajans titration method?

<p>Until the color of the yellow precipitate just changes to green (C)</p> Signup and view all the answers

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