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Mastering Ion Selective Electrodes and Potentiometry

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Mastering Ion Selective Electrodes and Potentiometry

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Questions and Answers

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?

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)?

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?

<p>To selectively uptake a specific ion</p> Signup and view all the answers

What is the characteristic of current flow during a potentiometric measurement?

<p>There is no current flow</p> Signup and view all the answers

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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Description

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.