WorksheetsElectrochemistry
Total questions: 10
Worksheet time: 8mins
What is the primary role of the three-electrode cell configuration in electrochemistry?
To separate the working electrode from ions
To minimize electrolyte evaporation
To maintain constant solution temperature
To control potential while measuring current
In cyclic voltammetry, changes in peak separation and peak current with scan rate mainly reflect:
Electrolyte conductivity changes
Kinetics and reversibility
Solution buffering capacity
Counter electrode surface area
Which electrode provides a stable potential used to control the working electrode’s voltage?
Reference electrode
Indicator electrode
Counter electrode
Working electrode
Square Wave Anodic Stripping Voltammetry is best suited for detecting which type of analytes?
High-voltage battery faults
Protein folding intermediates
Gas-phase reactive radicals
Trace metal ions in solutions
In Square Wave Anodic Stripping Voltammetry (SWASV), what is the main purpose of the pre-concentration (deposition) step?
To increase the temperature of the electrode surfaces
To remove dissolved oxygen from the electrolyte
To accumulate the target metal ions onto the electrode
To clean the counter electrode before measurement
In an electrochemical sensor, the working electrode primarily:
Maintains the reference voltage
Provides the surface for analyte redox
Balances ionic strength of the cell
Heats the electrolyte solution
During cyclic voltammetry of a reversible system, the forward and reverse peaks represent:
Reduction and oxidation reactions
Ion motion in the counter electrode
Temperature drift in the cell
Electrolyte decomposition pathways
Which factor most strongly influences the stripping peak current in SWASV?
Reference electrode geometry
Deposition time of metals
Solution color changes
Ambient laboratory temperature
The counter (auxiliary) electrode in a three-electrode cell primarily serves to:
Provide a fixed reference potential
Maintain constant ionic strength
Act as the sensing interface
Supply current to close the circuit
Which statement best describes a requirement for an ideal reference electrode?
Stable, well-defined potential
Reactive surface to catalyze analyte
Large surface area and roughness
Porous structure for mass transport
