Podcast
Questions and Answers
Which titration uses the appearance of a precipitate as the endpoint detection method?
Which titration uses the appearance of a precipitate as the endpoint detection method?
- Titration of CN- by Ag+
- Titration of Cl- and Br- by AgNO3 (correct)
- Titration of Ag+ by SCN-
- Titration of Ag+ by CN-
In Mohr's method, the medium must be neutral or slightly alkaline to prevent the conversion of chromate into what?
In Mohr's method, the medium must be neutral or slightly alkaline to prevent the conversion of chromate into what?
- Dichromate (correct)
- Chromic acid
- Chromium trioxide
- Chromic oxide
In Fajan's method of endpoint detection in precipitimetry, what is used?
In Fajan's method of endpoint detection in precipitimetry, what is used?
- Soluble colored complexes
- Adsorption indicators (correct)
- Redox indicators
- Colored precipitates
In Fajan's method, when are acidic dyes preferentially adsorbed by the precipitate at the equivalence point?
In Fajan's method, when are acidic dyes preferentially adsorbed by the precipitate at the equivalence point?
In Fajan's method, when are basic dyes preferentially adsorbed by the precipitate at the equivalence point?
In Fajan's method, when are basic dyes preferentially adsorbed by the precipitate at the equivalence point?
What type of indicator is used in Fajan's method of endpoint detection in precipitimetry?
What type of indicator is used in Fajan's method of endpoint detection in precipitimetry?
In Fajan's method, which type of dye is preferentially adsorbed by the precipitate when titrating AgNO3 with chloride or bromide ions?
In Fajan's method, which type of dye is preferentially adsorbed by the precipitate when titrating AgNO3 with chloride or bromide ions?
What is the purpose of the adsorption indicators used in Fajan's method?
What is the purpose of the adsorption indicators used in Fajan's method?
Which of the following is a requirement for the successful use of adsorption indicators in Fajan's method?
Which of the following is a requirement for the successful use of adsorption indicators in Fajan's method?
In Mohr's method, what is the required medium for the titration?
In Mohr's method, what is the required medium for the titration?
Which method is used to titrate Ag+ by CN-?
Which method is used to titrate Ag+ by CN-?
Which method is used to determine Cl- and Br- by AgNO3 using chromate ion as an indicator?
Which method is used to determine Cl- and Br- by AgNO3 using chromate ion as an indicator?
Under which pH conditions are weak acidic dyes, such as fluorescein, used in Fajan's method?
Under which pH conditions are weak acidic dyes, such as fluorescein, used in Fajan's method?
Which dye can be used at pH 4 in Fajan's method?
Which dye can be used at pH 4 in Fajan's method?
Why can't eosin be used for Cl determination in Fajan's method?
Why can't eosin be used for Cl determination in Fajan's method?
True or False: One of the requirements for the successful use of adsorption indicators in Fajan's method is that the indicator dye ion must have the opposite charge to the precipitating titrant ion.
True or False: One of the requirements for the successful use of adsorption indicators in Fajan's method is that the indicator dye ion must have the opposite charge to the precipitating titrant ion.
True or False: Basic dyes are used in Fajan's method in an acidic medium to ensure their ionization.
True or False: Basic dyes are used in Fajan's method in an acidic medium to ensure their ionization.
True or False: Eosin can be used for Cl- determination in Fajan's method.
True or False: Eosin can be used for Cl- determination in Fajan's method.
Flashcards are hidden until you start studying
Study Notes
Precipitimetry
- Mohr's Method uses the appearance of a precipitate as the endpoint detection method.
- In Mohr's method, the medium must be neutral or slightly alkaline to prevent the conversion of chromate into dichromate.
- Fajan's Method uses adsorption indicators for endpoint detection in precipitimetry.
- Acidic dyes are preferentially adsorbed by the precipitate at the equivalence point in Fajan's method when the precipitate has a positive charge.
- Basic dyes are preferentially adsorbed by the precipitate at the equivalence point in Fajan's method when the precipitate has a negative charge.
- In Fajan's method, the type of indicator used is an adsorption indicator.
- When titrating AgNO3 with chloride or bromide ions in Fajan's method, anionic dyes are preferentially adsorbed by the precipitate.
- The purpose of adsorption indicators in Fajan's method is to change color when adsorbed onto the precipitate at the equivalence point.
- Successful use of adsorption indicators in Fajan's method requires that the precipitate forms a well-defined, compact layer at the equivalence point, which is essential for adsorption.
- Mohr's method requires a neutral or slightly alkaline medium for the titration.
- Liebig's method is used to titrate Ag+ by CN-.
- Mohr's method is used to determine Cl- and Br- by AgNO3 using chromate ion as an indicator.
- In Fajan's method, weak acidic dyes are used in a slightly acidic medium (pH 3-4) to ensure their ionization and adsorption onto the precipitate.
- Fluorescein (pH 4) can be used in Fajan's method.
- Eosin cannot be used for Cl determination in Fajan's method because chlorides do not bind to it strongly enough.
- True: One of the requirements for the successful use of adsorption indicators in Fajan's method is that the indicator dye ion must have the opposite charge to the precipitating titrant ion.
- False: Basic dyes are used in Fajan's method in an alkaline medium to ensure their ionization.
- False: Eosin cannot be used for Cl- determination in Fajan's method because chlorides do not bind to it strongly enough.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
