Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 23, Problem 23.8QAP
Interpretation Introduction
Interpretation:
The five sources of uncertaninty in pH measurements with a glass-reference electrode system should be explained.
Concept introduction:
Ion-selective electrode is a type of electrode that is composed of a thin membrane. The membrane allows the transportation of intended ions only.
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Although the hydrogen electrode may be conceptually the simplest electrode and is the basis for the choice of reference potential in electrochemical systems, it is cumbersome to use. Therefore, several substitutes for it have been devised. One of these alternatives is the quinhydrone electrode (quinhydrone, Q ⋅ QH2, is a complex of quinone, C6H4O2 = Q, and hydroquinone, C6H4O2H2 = QH2), where the concentrations of Q ⋅ QH2 and QH2 are equal to each other. The electrode half-reaction is Q(aq) + 2 H+(aq) + 2 e− → QH2(aq), E⦵ = +0.6994 V. If the cell Hg(s)|Hg2Cl2(s)|HCl(aq)|Q ⋅ QH2|Au(s) is prepared, and the measured cell potential is +0.190 V, what is the pH of the HCl solution?
Discuss design features of Standard Hydrogen Electrode (SHE). Using suitable diagram explain how SHE can be used to measure the standard potential of Magnesium (Mg) electrode.
Chapter 23 Solutions
Principles of Instrumental Analysis
Ch. 23 - Prob. 23.1QAPCh. 23 - Prob. 23.2QAPCh. 23 - Prob. 23.3QAPCh. 23 - Prob. 23.4QAPCh. 23 - Prob. 23.5QAPCh. 23 - Prob. 23.6QAPCh. 23 - Prob. 23.7QAPCh. 23 - Prob. 23.8QAPCh. 23 - Prob. 23.9QAPCh. 23 - List the advantages and disadvantages of a...
Ch. 23 - Prob. 23.11QAPCh. 23 - What arc the advantages of microfabricated ISEs?...Ch. 23 - Prob. 23.13QAPCh. 23 - Prob. 23.14QAPCh. 23 - Prob. 23.15QAPCh. 23 - The following cell was used for the determination...Ch. 23 - The following cell was used to determine the pSO4...Ch. 23 - The formation constant for the mercury(II) acetate...Ch. 23 - Prob. 23.19QAPCh. 23 - The cell Ag|AgCl(sat’d)||H+(a = x)|glass electrode...Ch. 23 - The following cell was found to have a potential...Ch. 23 - The following cell was found to have a potential...Ch. 23 - The following cell was found to have a potential...Ch. 23 - Prob. 23.24QAPCh. 23 - Prob. 23.25QAPCh. 23 - Prob. 23.26QAPCh. 23 - Prob. 23.27QAP
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- From the standard potentials Tl++eTl(s)E0=0.336V TlCl(s)+eTl(s)+ClE0=0.557V calculate the solubility product constant for TlCl.arrow_forwardThe exchange-current density for a Pt|Fe3+,Fe2+ electrode is 2.5 mA cm−2. The standard potential of the electrode is +0.77 V. Derive an expression for the current flowing through an electrode of surface area 1.0 cm2 as a function of the potential applied to the electrode; assume standard conditions.arrow_forwardDiscuss design features of Standard Hydrogen Electrode (SHE). Using suitable diagram explain how SHE can be used to measure the standard potential of copper (Cu) electrode.arrow_forward
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