Analytical Chemistry: Electrochemistry Lecture Quiz
30 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What forms a dark blue complex with triiodide ions, indicating the endpoint in certain titrations?

  • Aluminum
  • Starch (correct)
  • Iron(III)
  • Silver

    • In an oxidation/reduction titration, why must the analyte initially be in a single oxidation state?

  • To make the titration process faster
  • To prevent interference from excess reagent
  • To enhance the color change of the indicator
  • To ensure accurate titration results (correct)

    • What is necessary for an auxiliary reducing agent to be useful as a prooxidant or a pre reductant in titrations?

  • Interference with the standard solution
  • Formation of a gas
  • Color change of the solution
  • Quantitative reaction with the analyte (correct)

    • What is a measure of the tendency of an electrochemical cell reaction to proceed toward equilibrium?

    <p>Cell potential</p> Signup and view all the answers

    Which electrode is where a reduction reaction occurs in an electrochemical cell?

    <p>Cathode</p> Signup and view all the answers

    What has been used as a universal reference electrode in electrochemistry?

    <p>Standard hydrogen electrode (SHE)</p> Signup and view all the answers

    What is the purpose of using sodium bismuthate in the context provided?

    <p>To act as an oxidizing agent</p> Signup and view all the answers

    Which of the following metals is NOT included in the list provided as good reducing agents?

    <p>Iron</p> Signup and view all the answers

    What is the main function of a pH electrode in the clinical laboratory according to the passage?

    <p>To assess pH levels</p> Signup and view all the answers

    In the context of potentimetry, what is the primary role of the liquid junction?

    <p>To prevent contamination between samples</p> Signup and view all the answers

    Which solution is commonly used as a filling solution due to the similar mobility of its ions?

    <p>$KCl$ solution</p> Signup and view all the answers

    What is the purpose of the null-balance technique in the context of potentimetry?

    <p>To ensure accurate voltage readings</p> Signup and view all the answers

    What is the Ilkovic equation used to show?

    <p>The relationship between analyte diffusion coefficient and analyte concentration</p> Signup and view all the answers

    What does Faraday's Law relate the number of coulombs consumed to?

    <p>The amount of electricity at a fixed potential</p> Signup and view all the answers

    In amperometry, what is the equivalence point established by?

    <p>Changes in average of current passing through a solution</p> Signup and view all the answers

    What does coulometry measure in terms of current flow?

    <p>Current flow between non-polarizable electrodes</p> Signup and view all the answers

    How is electrical connection achieved between the indicator and reference electrodes in polarography?

    <p>By allowing a slow flow LMVP III</p> Signup and view all the answers

    What does amperometry measure?

    <p>Current flow when a constant voltage is applied</p> Signup and view all the answers

    What is the primary focus of electrochemical analyses in the clinical laboratory?

    <p>Measuring the current or voltage generated by specific ions</p> Signup and view all the answers

    Which type of cell is spontaneously produced when the external E is turned off in an electrolytic cell?

    <p>Galvanic cell</p> Signup and view all the answers

    What is the primary role of a reducing agent in a redox reaction?

    <p>Donating electrons</p> Signup and view all the answers

    Which of the following is NOT a common type of electrochemical analysis used in the clinical laboratory?

    <p>Spectrometry</p> Signup and view all the answers

    What is the primary function of a salt bridge in an electrochemical cell?

    <p>To allow ions to flow between the two half-cells</p> Signup and view all the answers

    Which of the following is NOT a characteristic of an oxidation-reduction titration?

    <p>Involves a change in the chemical structure of reactants</p> Signup and view all the answers

    What type of cell operates spontaneously and requires no external source of electrical energy?

    <p>Galvanic cell</p> Signup and view all the answers

    What happens to a galvanic cell when one of the chemical components is depleted?

    <p>The cell becomes a dead cell and cannot produce electrical energy</p> Signup and view all the answers

    What is the effect of the completeness of a reaction on the titration curves for oxidation/reduction reactions?

    <p>The change in the equivalence-point region becomes larger</p> Signup and view all the answers

    What substances can function as true redox indicators?

    <p>Substances that change color upon being oxidized or reduced</p> Signup and view all the answers

    What type of cell requires an external source of electrical energy for operation?

    <p>Electrolytic cell</p> Signup and view all the answers

    What is formed at the cathode when electrons pass through the external meter in a galvanic cell?

    <p>OH− ions</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser