Answered: 21.25 What is the difference between an…

21.25 What is the difference between an active and an inactive electrode? Why are inactive electrodes used? Name two sub- stances commonly used for inactive electrodes.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter25: Voltammetry

Section: Chapter Questions

Problem 25.9QAP

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Concept explainers

Potentiometric Titrations

Potentiometric titration is one of the important titration methods and is mainly carried out to characterize acid solutions. It follows a method similar to that of the normal titration technique, but the main difference is that there is no indicator used in the potentiometric titrations. Instead of using an indicator, electrodes are employed for monitoring the whole titration process. A scientist named Robert Behrend did the potentiometric titration for the first time, and it was done using the mercurous solution and potassium chloride.

Question

21.25 What is the difference between an active and an inactive
electrode? Why are inactive electrodes used? Name two sub-
stances commonly used for inactive electrodes.

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The following cell was found to have a potential of 0.124 V: Ag|AgCl(sat’d)||Cu2+ (3.25 10-3 M|mernbrane electrode for Cu2+ When the solution of known copper activity was replaced with an unknown solution, the potential was found to be 0.055 V. What was the pCu of this unknown solution? Neglect the junction potential.
Suppose Ered for H+H2 were taken to be 0.300 V instead of 0.000 V. What would be (a) Eox for H2H+ ? (b) Ered for Br2Br ? (c) E for the cell in 34(c)? Compare your answer with that obtained in 34(c).
What is the difference between an active and an inactiveelectrode? Why are inactive electrodes used? Name two sub-stances commonly used for inactive electrodes.
Why is SHE considered as the standard electrode?
What are the electrochemical technique used in fluoride ion-selective electrode?
The main advantage of using a saturated KCl solution at the reference electrode is,A. Potassium chloride is cheapB. Easy reaction with analyteC. Easy passage of chloride ions through membranesD. The chloride concentration does not change when the liquid evaporates from the cell
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