Potentiometry and Electrodes Quiz
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Questions and Answers

What is the most common ion-selective electrode?

  • Combination probe (correct)
  • Membrane indicators
  • Hydration process
  • Junction potential drift
  • What must be done before a glass electrode functions as a pH electrode?

  • Acid error
  • Hydration process (correct)
  • Junction potential drift
  • Alkaline error
  • What error occurs when [H+] is very low and [Na+] is high?

  • Junction potential drift
  • Combination probe
  • Hydration process
  • Alkaline error (correct)
  • How often should the glass electrode be recalibrated to compensate for junction potential drift?

    <p>Every 2 hours</p> Signup and view all the answers

    What exists at the porous plug near the bottom of the electrode?

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

    What component can cause a change in junction potential even if the pH of two solutions is the same?

    <p>[Na+]</p> Signup and view all the answers

    What type of electrodes are commonly used in potentiometry?

    <p>Metallic indicator electrodes</p> Signup and view all the answers

    Which type of electrode involves a thin glass membrane separating two solutions with different hydrogen ion concentrations?

    <p>Glass pH electrode</p> Signup and view all the answers

    What is the purpose of a saturated calomel reference electrode in potentiometry?

    <p>To provide reproducible potentials</p> Signup and view all the answers

    Which type of electrode responds selectively to one ion and allows rapid determination of cations and anions?

    <p>Crystalline membrane electrode</p> Signup and view all the answers

    In potentiometry, which electrodes serve as source or sink for electrons in redox half reactions?

    <p>Metallic redox indicators</p> Signup and view all the answers

    What is the main function of metallic indicator electrodes?

    <p>To respond to activities of anions</p> Signup and view all the answers

    What is the advantage of using a Calomel Reference Electrode?

    <p>Reacting with fewer sample components</p> Signup and view all the answers

    Which electrode can be used at temperatures greater than 60ºC?

    <p>Silver-silver Chloride Reference Electrode</p> Signup and view all the answers

    What is the main advantage of using a Silver-silver Chloride Reference Electrode?

    <p>High temperature resistance</p> Signup and view all the answers

    Which type of electrode involves direct equilibrium with its cation in the solution?

    <p>Metallic Electrodes</p> Signup and view all the answers

    What is a limitation of electrodes of the first kind, such as Metallic Electrodes?

    <p>Not very selective and respond to more easily reduced cations</p> Signup and view all the answers

    Which type of indicator electrode is ideal for providing a rapid and reproducible response to changes in analyte ion concentration?

    <p>Membrane Indicator Electrodes</p> Signup and view all the answers

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