30 Questions
What is the major difference between the equivalence point and the end point in a titration?
Volume difference
Why are weak acids and bases never used as standard reagents in acid-base titrations?
They react incompletely with analytes
Why are HCl and NaOH classified as secondary standard solutions?
They are less pure than primary standards
In complexometric titration, what forms a covalent bond with a metal atom to produce a complex?
Ligand
What type of acid-base titration results in a solution with pH greater than 7 at the equivalence point?
Weak acid + strong base
Why is EDTA commonly used as a complexometric titrant?
It forms a colored complex with metal ions
What type of ligand has two groups available for covalent bonding?
Bidentate
In precipitation titration, what method is based on the formation of slightly soluble precipitates?
Precipitation titration
Which method of detection of endpoint utilizes adsorption indicators?
Fajans Method
What does an acid-base indicator do in a titration?
Undergoes color change near the equivalence point
Why is AgCl ppt. in the Volhard method filtered before undertaking the back titration?
To prevent interference with the back titration
In the Volhard method, why must the solution be a strong acid?
To avoid side reactions involving hydroxide ions
Why is the pH range of Mohr method titration specified to be between 6.5-9?
To avoid unwanted precipitate formation
Why is the Volhard method rarely used nowadays?
It is time-consuming due to multiple steps involved
Why does the first drop of excess Ag+1 react with Fluorescein indicator in the Volhard method?
To indicate the endpoint of the titration
Why does the Mohr method not use CrO4-2 for titrations involving Ag+1?
CrO4-2 forms a complex that interferes with endpoint detection
Why does the Volhard method not use for determination of SCN-1?
Scn-1 forms a colored complex that affects endpoint detection
What is the purpose of using a strong acid solution in the Volhard method?
To prevent side reactions involving hydroxide ions
Why do types of redox indicators differ based on their oxidized and reduced forms' colors?
To provide visual cues for endpoint detection during titrations.
In oxidation-reduction reactions, what characterizes an oxidizing agent?
Substance that accepts electrons and gets oxidized.
What is the purpose of titration methods in Analytical Chemistry?
To measure the quantity of a reagent needed to react with the analyte completely
What is the function of a standard solution in volumetric titrations?
To be a solution of known concentration
When is back-titration used in titration methods?
When stability of the standard solution is a concern
What is the Equivalence point in a titration?
The point when added standard reagent equals the analyte
Which statement best describes an Analyte in titration methods?
It's a solution of unknown concentration but known volume
In a volumetric titration, why is it important to measure the volume of the standard solution needed for complete reaction?
To know how much reagent is needed for complete reaction
What does the End Point indicate in a titration?
The completion of the titration reaction
How is back-titration different from direct titration?
In back-titration, an excess of one standard solution reacts with an analyte first.
What is the role of the burette in volumetric titrations?
To deliver controlled amounts of standard solution to the analyte.
When is a back-titration preferred over direct titration?
When there are issues with slow reactions or unstable standard solutions.
Explore the principles of titration methods in analytical chemistry, where the quantity of a reagent of known concentration is measured to react with the analyte. Learn about volumetric titrations and the role of the analyte (titrand) in these quantitative methods.
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