Which of the following is incorrect about chemical indicators used in precipitat

Question

Which of the following is incorrect about chemical indicators used in precipitation titration?

a) In the titration of Cl- with Ag+ ion using the Fajans method, the color change occurring at the end point is attributed to the absorption of dichlorofluorescein anion into the AgCl precipitate.

b) In the determination of Cl- by Ag+-based back titration using the Volhard method, the color change occurring at the end point is from light yellow to bright red.

c) It is preferable to conduct the precipitation titration under the acidic conditions when the Volhard method is used.

d) It is desirable to conduct the precipitation titration under slightly basic conditions when the Fajans method is used.

Explanation / Answer

The only incorrect option is Option B

a) The statement is correct since end point is attributed to the absorption of dichlorofluorescein anion into the AgCl precipitate.

c) Volhard method is conducted under acidic medium, mostly HNO3 is used as acid for this reaction

d) Since the other reactants are slightly acidic, the basic solution or condition is maintained at the time of Fajans method

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