Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 25, Problem 25.9QAP
Interpretation Introduction
Interpretation:
The method of calculating the half-wave potential of a species reacting at an electrode using equation 25-13 is to be stated.
Concept introduction:
The half-wave potential of a species reacting at an electrode is the potential. The current of the polarographic is equal to the half of the diffusion current at the half-wave potential. It is unique for the each element.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
What would the potential of a standard hydrogen electrode (S.H.E.) be under the following conditions?
The sensitivity of a coulometer is governed by the delivery of its minimum current for its minimum time. Suppose that 5 mA can be delivered for 0.1 s.(a) How many moles of electrons are delivered at 5 mA for 0.1 s? (b) How many milliliters of a 0.01 M solution of a two-electron reducing agent are required to deliver the same number of electrons?
Write the processes by which adsorption of electrolyte or ionic species at electrode
surface take place.
Chapter 25 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Explain the significance of the standard hydrogen electrode (SHE) in the tabulation of standard reduction potentials of other species.arrow_forwardThe table below gives the standard electrode potential values of some electrode. What standard reference electrode could be used to obtain the values in the table and under what conditions is the standard electrode used? Under what 4 conditions will the standard emf of electrode IV be obtained?arrow_forwardWhy is SHE considered as the standard electrode?arrow_forward
- ELECTROCHEMICAL CELLS AND LE CHÂTELIER'S PRINCIPLE 25-13. Consider an electrochemical cell in which the reaction is described by the equation 2 HC1(aq) + Ca(s) = CaCl, (aq) + H,(g) Predict the effect of the following changes on the cell voltage: (a) decrease in amount of Ca(s) (b) increase in pressure of H,(g) (c) increase in [HCl] (d) dissolution of Ca(NO3)2(s) in the CaCl, (aq) solutionarrow_forwardExpress the relation among the conductivity of solution in the cell, the cell constant and the resistance cf solution in the cell.arrow_forward: Standard hydrogen electrode is considered as a reference electrode because .A Its high potential .B Its low potential .c Its zero potentialarrow_forward
- The 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_forwardwhy the reference electrode can serve as a probe to measure relativereduction potentials or even detect a change in pH of solutionarrow_forwardThe resistances of a series of aqueous NaCl solutions, formed by successive dilution of a sample, were measured in a cell with cell constant (the constant C in the relation κ = C/R) equal to 0.2063 cm-1 and the following values were found at 25oC: c/(mol dm−3) 0.00050 0.0010 0.0050 0.010 0.020 0.050 R/W 3314 1669 342.1 174.1 89.08 37.14 Find the molar conductance of NaCl at 25oC at infinite dilution from the graph.arrow_forward
- Significant evolution or deposition occurs in electrolysis only if the overpotential exceeds about 0.6 V. To illustrate this criterion calculate the effect that increasing the overpotential from 0.40 V to 0.60 V has on the current density in the electrolysis of 1.0 m NaOH(aq), which is 1.0 mA cm−2 at 0.4 V and 25 °C. Take α = 0.5. Hint: Assume that the current is entirely anodic.arrow_forwardDerive Paschen's law and the minimum breakdown voltage in electronegative gases, then draw the relationship between them.arrow_forwardAlthough 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?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Physical ChemistryChemistryISBN:9781133958437Author:Ball, David W. (david Warren), BAER, TomasPublisher:Wadsworth Cengage Learning,
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Physical Chemistry
Chemistry
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Wadsworth Cengage Learning,