Electrodes and Potentiometry

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Questions and Answers

What is potentiometry?

Potentiometry is a method of measuring the potential of an electrochemical cell under static conditions where no current flows through the cell.

Why is potentiometry a useful quantitative method?

Potentiometry is useful because the composition of the electrochemical cell remains unchanged during measurement.

What are ISE+ portable devices used for in potentiometry?

ISE+ portable devices are used for real-time analysis without the need for sample preparation or power (voltmeters).

What is the behavior of ions in very dilute solutions?

In very dilute solutions, ions behave independently of each other and exhibit ideal behavior due to complete solvation or infinite dilution. Signup and view all the answers

How does the presence of ions with the opposite charge affect the behavior of ions in solution?

The presence of ions with the opposite charge reduces the effectiveness of ions as free ions and affects both reactivity and the size of potentials at the measuring electrode. Signup and view all the answers

What is the purpose of an ion-selective electrode (ISE) in potentiometry?

The purpose of an ISE is to measure the potential or voltage of an electrochemical cell, which provides information about the amount of analyte in a sample. Signup and view all the answers

How is the selectivity of an ISE determined?

The selectivity of an ISE is determined by the composition of the membrane, which ideally allows the uptake of only one specific ion into it. Signup and view all the answers

What are the three main components required for making a measurement at an ISE?

The three main components required for making a measurement at an ISE are an inner reference or standard solution, an outer analyte, and the ISE itself. Signup and view all the answers

What is the role of the reference electrode in potentiometry?

The reference electrode in potentiometry provides a constant potential, against which the potential developed at the indicator electrode is measured. Signup and view all the answers