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Questions and Answers
Which component of an ion-selective electrode determines its selectivity?
Which component of an ion-selective electrode determines its selectivity?
- The indicator electrode
- The solid state membrane (correct)
- The analyte ion
- The reference electrode
What is the purpose of the reference electrode in a potentiometric measurement?
What is the purpose of the reference electrode in a potentiometric measurement?
- To allow current flow during the measurement
- To maintain a constant potential (correct)
- To provide information about the amount of analyte in a sample
- To measure the potential of the electrochemical cell
What is the main purpose of an ion-selective electrode (ISE)?
What is the main purpose of an ion-selective electrode (ISE)?
- To selectively uptake a specific ion
- To provide information about the amount of analyte in a sample (correct)
- To measure the current flow in an electrochemical cell
- To determine the composition of the reference electrode
What is the role of the analyte ion in a potentiometric measurement with an ISE?
What is the role of the analyte ion in a potentiometric measurement with an ISE?
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What is the characteristic of current flow during a potentiometric measurement?
What is the characteristic of current flow during a potentiometric measurement?
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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.
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