Analytical Chemistry 1st Stage: Volumetric Analysis Quiz

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Questions and Answers

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?

<p>Volumetric titrimetric (D)</p> Signup and view all the answers

What is the end point in a titration?

<p>The point when a physical change occurs associated with chemical equivalence (D)</p> 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?

<p>Titration (B)</p> Signup and view all the answers

What is the purpose of using indicators in titration?

<p>To produce an observable physical change at the equivalence point (C)</p> Signup and view all the answers

When is back-titration used in titrimetric analysis?

<p>When the rate of reaction between the analyte and reagent is slow (A)</p> Signup and view all the answers

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

<p>To establish the purity of the compound by chemical analysis (C)</p> Signup and view all the answers

What are important requirements for a primary standard?

<p>Absence of hydrate water to prevent changes in composition with humidity variations (D)</p> Signup and view all the answers

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

<p>Because established methods for confirming purity are available for very few compounds (D)</p> Signup and view all the answers

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

<p>Sufficient stability requiring determination of its concentration only once (A)</p> Signup and view all the answers

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

<p>To determine the excess amount of standard titrant (A)</p> Signup and view all the answers

Why are back-titrations often required in titrimetric analysis?

<p>To determine the excess amount of the standard titrant (D)</p> Signup and view all the answers

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

<p>React more or less completely with the analyte to ensure satisfactory end points (A)</p> Signup and view all the answers

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

<p>Because their purity cannot be established by chemical analysis (D)</p> Signup and view all the answers

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