Concept explainers
(a)
Interpretation:
A spreadsheet should be created to calculate the standard electrode potential for the Ag-AgCl electrode.
Concept introduction:
Overall equation:
Activity coefficient of ions can be calculated by Debye-Huckel equation,
Zx − charge on the species X
Ionic strength is defined by the equation,
C1, C2, C3 − molar concentrations of various ions in the solution
Z1, Z2, Z3 − charges on the ions.
For the electrolyte AmBn, the mean activity coefficient is given by
(b)
Interpretation:
The values obtained in part (a) for the activity coefficients and standard potential should be compared with those of MacInnes and if there are any differences, a possible reason for the discrepancies should be suggested.
Concept introduction:
Overall equation:
(c)
Interpretation:
The mean, standard deviation, 95 % confidence interval, and other useful statistics for the standard potential of the Ag-AgCl electrode should be found by using descriptive statistics function of Excel.
Concept introduction:
Overall equation:
(d)
Interpretation:
The analysis results and the quality of the MacInne’s results should be compared and discussed.
Concept introduction:
Overall equation:
Want to see the full answer?
Check out a sample textbook solutionChapter 22 Solutions
Principles of Instrumental Analysis
- The following cell was found to have a potential of —0.492 V: Ag|AgCl(sat’d)||HA(0.200 M),NaA(0.300 M)|H2(1.00 atm),Pt Calculate the dissociation constant of HA, neglecting the junction potential.arrow_forwardCalculate the electrode potentials for the following systems: (a) Cr2O72-(5.00 10-3 M),Cr3+(2.50 10-2 M),H+ (0.100 M)|Pt (b) UO22+(0.100 M),U4+ (0.200 M),H+ (0.600 M)|Ptarrow_forwardThe measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25 00C is given by the equation where contains the potential of the reference electrode and all other potentials that arise in the cell that are not related to the hydrogen ion concentration. Assume that = 0.250 V and that a. What is the uncertainty in the values of pH and [H+] if the uncertainty in the measured potential is 1 m V ( 0.001 V)? b. To what precision must the potential be measured for the uncertainty in pH to be 0.02 pH unit?arrow_forward
- At what pH does Ecell = 0.00 V for the reduction of dichromate by iodide ion in acid solution, assuming standard-state concentrations of all species except H+ ion?arrow_forwardFor the following half-reaction, = 2.07 V: A1F63(aq)+3eAl(s)+6F(aq) Using data from Table 17-1, calculate the equilibrium constant at 25C for the reaction A13+(aq)+6F(aq)A1F63(aq)K=?arrow_forwardHalide ions can he deposited at a silver anode, the reaction being Ag(s) + X- AgX(s) +e- Suppose that a cell was formed by immersing a silver anode in an analyte solution that was 0.0250 M Cl-,Br-, and I -ions and connecting the half-cell to a saturated calomel cathode via a salt bridge. (a) Which halide would form first and at what potential? Is the cell galvanic or electrolytic? (b) Could I- and Br- be separated quantitatively? (Take 1.00 l0-5 M as the criterion for quantitative removal of an ion.) If a separation is feasible, what range of cell potential could he used? (c) Repeat part (b) for I- and Cl-. (d) Repeat part (b) for Br- and Cl-.arrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: The Molecular ScienceChemistryISBN:9781285199047Author:John W. Moore, Conrad L. StanitskiPublisher:Cengage Learning