Analytical Chemistry 1st Stage: Volumetric Analysis Quiz

What is the purpose of an indicator in volumetric titrimetric analysis?

To signal when the end point of the reaction has occurred (correct)

To measure the concentration of the analyte

To determine the volume of the standard reagent

To deliver the known standard reagent from a burette

What is the equivalence point in a titration?

The point when the amount of added standard reagent is exactly equivalent to the amount of analyte (correct)

The point when a physical change occurs associated with chemical equivalence

The point when the reaction between the analyte and reagent is judged to be complete

The point when the volume of added standard reagent is measured

What is a standard solution in titrimetric analysis?

A solution with a known volume

A solution used to measure the concentration of an analyte

A solution used to signal the end point of the reaction

A reagent of exactly known concentration used in a titrimetric analysis (correct)

In which type of titrimetric analysis is the volume of a standard reagent the measured quantity?

Volumetric titrimetric Signup and view all the answers

What is the end point in a titration?

The point when a physical change occurs associated with chemical equivalence Signup and view all the answers

What term is used for the process in which a standard reagent is added to a solution until the reaction between the analyte and reagent is judged to be complete?

Titration Signup and view all the answers

What is the purpose of using indicators in titration?

To produce an observable physical change at the equivalence point Signup and view all the answers

When is back-titration used in titrimetric analysis?

When the rate of reaction between the analyte and reagent is slow Signup and view all the answers

What is the purpose of using a secondary standard in titrimetric analysis?

To establish the purity of the compound by chemical analysis Signup and view all the answers

What are important requirements for a primary standard?

Absence of hydrate water to prevent changes in composition with humidity variations Signup and view all the answers

Why do very few compounds meet or even approach the criteria for a primary standard?

Because established methods for confirming purity are available for very few compounds Signup and view all the answers

What is an ideal property of a standard solution for titrimetric methods?

Sufficient stability requiring determination of its concentration only once Signup and view all the answers

What is the purpose of using a measured excess of standard silver nitrate in titrimetric analysis?

To determine the excess amount of standard titrant Signup and view all the answers

Why are back-titrations often required in titrimetric analysis?

To determine the excess amount of the standard titrant Signup and view all the answers

What role do standard solutions play in titrimetric methods of analysis?

React more or less completely with the analyte to ensure satisfactory end points Signup and view all the answers

Why are less pure compounds sometimes used as secondary standards instead of primary standards?

Because their purity cannot be established by chemical analysis Signup and view all the answers