18 Questions
What is the most common ion-selective electrode?
Combination probe
What must be done before a glass electrode functions as a pH electrode?
Hydration process
What error occurs when [H+] is very low and [Na+] is high?
Alkaline error
How often should the glass electrode be recalibrated to compensate for junction potential drift?
Every 2 hours
What exists at the porous plug near the bottom of the electrode?
Junction potential
What component can cause a change in junction potential even if the pH of two solutions is the same?
[Na+]
What type of electrodes are commonly used in potentiometry?
Metallic indicator electrodes
Which type of electrode involves a thin glass membrane separating two solutions with different hydrogen ion concentrations?
Glass pH electrode
What is the purpose of a saturated calomel reference electrode in potentiometry?
To provide reproducible potentials
Which type of electrode responds selectively to one ion and allows rapid determination of cations and anions?
Crystalline membrane electrode
In potentiometry, which electrodes serve as source or sink for electrons in redox half reactions?
Metallic redox indicators
What is the main function of metallic indicator electrodes?
To respond to activities of anions
What is the advantage of using a Calomel Reference Electrode?
Reacting with fewer sample components
Which electrode can be used at temperatures greater than 60ºC?
Silver-silver Chloride Reference Electrode
What is the main advantage of using a Silver-silver Chloride Reference Electrode?
High temperature resistance
Which type of electrode involves direct equilibrium with its cation in the solution?
Metallic Electrodes
What is a limitation of electrodes of the first kind, such as Metallic Electrodes?
Not very selective and respond to more easily reduced cations
Which type of indicator electrode is ideal for providing a rapid and reproducible response to changes in analyte ion concentration?
Membrane Indicator Electrodes
Test your knowledge on potentiometry and different types of electrodes used in electrochemistry. Learn about metals that dissolve in acidic solutions, easily oxidized metals, and electrodes like Ag/Ag+ and S.C.E. used in measurements.
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