Determine the distance between the metal and the OHP layer using the Helm-holtz model when the electrode's differential capacitance is 145 μF cm².DATA: dielectric constant of the medium for the interfacial zone &r=lectric constant of the vacuum &0 = 8.85-10-12 F m-1= 50, die-

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Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter10: Potentiometry And Redox Titrations

Section: Chapter Questions

Problem 2P

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Calculate the distance between the metal and the OHP layer from the Helmholtz model, when the differential capacitance of the electrode is 155 microF cm-2.Data: dielectric strength of the medium for the interfacial zone epsilonr = 50, dielectric strength of the vacuum epsilon0 = 8.85·10-12 F m-1
Calculate the dielectric constant of the medium for the zone between a metal and the OHP layer from the Helmholtz model, when the differential capacitance of the electrode is 1.4 mF cm-2. Indicate, according to this model, what this differential capacity will be like when the potential is reduced by half. Data: distance between metal and OHP layer 4 A, vacuum dielectric constant epsilon0 = 8.85·10-12 F m-1
The resistances of a series of aqueous NaCI 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. The following values were found: c/(mol dm-3) 0.00050 0.0010 0.0050 0.010 0.020 0.050R/Ω 3314 1669 342.1 172.5 89.08 3714(a) Verify that the molar conductivity follows the Kohlrausch law and find the limiting molar conductivity. (b) Determine the coefficient κ, (c) Use the value of κ (which should depend only on the nature, not the identity of the ions) and the information that λ(Na+) = 5.01 mS m2 mol-1 and , λ(I-) = 768 mS m2 mol-1, to predict (i) the molar conductivity, (ii) the conductivity,(iii) the resistance it would show in the cell, of 0.010 mol dm-3 Nal(aq) at 25 °C.
The 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 K = C/R) equal to 0.2063 cm-1 and the following values were found at 25°C: c/(mol | 0.00050 0.0010 0.0050 0.010 0.020 | 0.050 dm-3) R/W 3314 1669 342.1 174.1 89.08 37.14 Find the molar conductance of Nacl at 25°C at infinite dilution from the graph.
-1! The concentrations of three dilute solutions of sodium acetate were measured in a con- ductance cell in which the parallel electrodes were 1 cm in area and 0.25 cm apart. Resistances of 274,700, 91,000 and 18,320 ohms were determined for the three solu- tions. Calculate the normality of each solution. T = 25°C.
A bare silver wire electrode is dipped into a solution 0.05M in KNO3 (supporting electrolyte) and saturated in AgBr (Ksp = 5.0 x 10-13), and connected to the back of an mV/pH meter along with a saturated calomel reference electrode. Calculate the potential of the silver indicator electrode. Calculate the cell potential.
Which reaction occurs at a saturated calomel electrode (SCE)a. H+(aq) + e- --------> 1/2H2(g)b. AgCl(s) + e- -------> Ag(s) + Cl-(aq)c. Fe3+(aq) + e- -------> Fe2+ (s)d. CuCl2(s) + 2e- -------> 2Cu(s) + 2Cl- (aq)e. Hg2Cl2 (s) + 2e- ---------> 2Hg(l) + 2Cl-(aq)
The resistance of a conductivity cell containing a 0.01 mol KCl solution cm-3 is 150 Ω and the conductivity of this KCl solution is 1.41 × 10-3 Ω-1 cm-1. The same conductivity cell resulting in a resistance of 51.40 Ω for 0.01 HCl solution mol cm-3. Calculate a cell constant and conductivity of the HCl solution.
Calibration of a glass electrode gave a reading of 139.1 mV with a 0.05 m potassium dihydrogen citrate buffer standard ( pH = 3.766), and a reading of -75.5 mV with a 0.08 m HEPES, 0.08 m NaHEPES, 0.08 m NaCl buffer standard (pH = 7.454). both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed= mV/pH What is the theoretical slope at 30 *C? slope theoretical What is B, the electromotive efficiency, to three significant figures? B= What is the pH of an unknown that gives a reading of 50.2 mV with this electrode at 30 "C? mV/pH
i need the answer quickly
7. In an experiment on the Pt| Ha| H' electrode in dilute H.SO4, the following current densities were observed at 25°C. Evaluate a and I, for the electrode. n/mV 50 100 150 I/ mA cm2 200 29.9 100 250 335 2.66 8.91
In a certain conductivity cell, the resistance of a 0.01 M KCl solution is 150 W. The known molar conductivity of the solution is 141.27 W-1 cm2 mol-1. Calculate the cell constant (Kcell). *(Kcell unit is cm-1)

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Determine the distance between the metal and the OHP layer using the Helm- holtz model when the electrode's differential capacitance is 145 μF cm². DATA: dielectric constant of the medium for the interfacial zone &r= lectric constant of the vacuum &0 = 8.85-10-12 F m-1 = 50, die-