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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?

Precipitation reaction (C) Signup and view all the answers

What is the purpose of Fajan's method?

To determine the purity of NaCl (A) Signup and view all the answers

What is the indicator used in Fajan's method?

Dichlorofluorescein (DCF) (C) Signup and view all the answers

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

To repress ionization of NaF (C) Signup and view all the answers

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

Potassium thiocyanate (C) Signup and view all the answers

What is the reaction that occurs between NaF and FeCl3?

NaF + FeCl3 → FeF63- (A) Signup and view all the answers

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

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

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

It forms a stable complex with zinc ions (A) 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?

Fajans Titration (D) Signup and view all the answers

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

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

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

99.0% - 100.5% (C) Signup and view all the answers

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

Precipitation reaction (D) Signup and view all the answers

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

To prevent the precipitation of silver sulfate (B) Signup and view all the answers

What is the endpoint of the Fajans titration method?

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

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