5 Questions
Which component of an ion-selective electrode determines its selectivity?
The solid state membrane
What is the purpose of the reference electrode in a potentiometric measurement?
To maintain a constant potential
What is the main purpose of an ion-selective electrode (ISE)?
To provide information about the amount of analyte in a sample
What is the role of the analyte ion in a potentiometric measurement with an ISE?
To selectively uptake a specific ion
What is the characteristic of current flow during a potentiometric measurement?
There is no current flow
Study Notes
Ion-Selective Electrodes (ISEs)
- The membrane of an ion-selective electrode determines its selectivity.
Reference Electrode
- The purpose of the reference electrode in a potentiometric measurement is to provide a stable potential against which the potential of the ion-selective electrode is measured.
Ion-Selective Electrode (ISE) Purpose
- The main purpose of an ion-selective electrode (ISE) is to measure the activity of a specific ion in a solution.
Analyte Ion Role
- The analyte ion in a potentiometric measurement with an ISE is the ion being measured, and its concentration determines the potential of the electrode.
Potentiometric Measurement
- In a potentiometric measurement, there is no current flow, as it is a non-faradaic process, and the electrodes are not subjected to an external potential.
Test your knowledge on ion selective electrodes and potentiometry. Learn about the role of indicator and reference electrodes in measuring the potential of electrochemical cells. Discover how the potential at the indicator electrode provides valuable information about analyte concentrations in a sample.
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