V3 3. The exchange current density at the electrode Pt| Fe"| Fe is 2.4 x 103 A cm 2. Howmany electrons are transported through the double layer per second in the cell (area of1 cm?)? Estimate the number of times per second that a single atom on the surface takespart in an electron transfer event, assuming that the atom occupies 280 pm? of thesurface of the electrode.4. Using the Randles-Sevic equation, calculate the current observed at a gold electrode ofdiameter 2 mm for the one electron reduction of ferricyanide (ImM) at scan rates of 50,100 and 200 mVs1. The diffusion coefficient of ferricyanide is 4.5 x 104 cm² s'.

The number of singly charged particles transported per unit time per unit area at equilibrium is the…

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Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter11: Dynamic Electrochemistry

Section: Chapter Questions

Problem 6P

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The exchange current density at the electrode Pt| Fe3+| Fe2+ is 2.4 x 10-3 A cm-2, How many electrons are transported through the double layer per second in the cell (area of 1 cm2 each)? Estimate the number of times per second that a single atom on the surface takes part in an electron transfer event, assuming that the atom occupies 280 pm2 of the surface of the electrode
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.
The boundary equivalent conductivity of the 0.1 M electrolyte with a resistance of 0.33 ohms was determined as 320 Scm-2mol-1 and the conductivity ratio was determined as 0.55. According to this information, the electrolyte; a) Equivalent conductivityb) Self conductivityb) Find the cell constant of the electrode used.
Provide as many error sources in your calibration of the ion-selective electrode (ISE) as you can.
How many electrons or protons are transported through the double layer per second for each of the electrodes Cu,H2|H+ and Pt|Ce4+,Ce3+ when they are at equilibrium at 25 °C? Take the area as 1.0 cm2 in each case. Estimate the number of times each second a single atom on the surface takes part in an electron transfer event, assuming an electrode atom occupies about (260 pm)2 of the surface.
Chemistry The exchange current density for the electrode Pt(s) │|H2(g) │|H+(aq) is 0.79mA cm-2 at 25°C. What is the current density in the electrode when its overpotential is 5.0 mV, and what is the anode current through of an electrode with a surface area of 5.0 cm2 Solution: . 0,15 mA cm-2, 0,75 mA
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.
Given that ΔrG⦵ = −212.7 kJ mol−1 for the reaction Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) in the Daniell cell at 25 °C, and b (CuSO4) = 1.00 × 10−3 mol kg−1 and b (ZnSO4) = 3.00 × 10−3 mol kg−1, calculate (a) the ionic strengths of the solutions, (b) the mean ionic activity coefficients in the compartments, (c) the reaction quotient, (d) the standard cell potential, and (e) the cell potential. (Take γ+ = γ− = γ± in the respective compartments. Use the Debye–Hückel limiting law.)
An ion selective electrode is utilised to determine the concentration of Ca2+ in the presence of Mg2+. The selectivity coefficient for the electrode kij is 0.015. If the concentrations of Ca2+ and Mg2+ are 50 and 500 ppm, respectively, calculate the change in potential (in mV) when the temperature of the measurement cell is increased from 20oC to 40oC.
After correction for the water conductivity, the conductivity of a saturated aqueous solution of AgCI at 25 °C was found to be 0.1887 mS m-1. Given that the limiting molar conductivity of AgCI at this temperature is 138.3 S cm2 mol-1 , what is the solubility of silver chloride at this temperature?
Create a calibration curve. Electrode potential (mV) vs. log [Ca2+]. (complete with, the equations of the best fit line, and the correlation coefficient) log[Ca 2+] Electrode potential (mV) -5 -105.4 -105.1 -106.5 -6 -120.9 -120.3 -120.6 -4.4 -96.6 -97.2 -96.5 -4 -85.5 -85.8 -85.2 -3 -56.6 -56.2 -56.4 -2 -26.6 -27.1 -27.1
2) Name the advantages of glass electrode in potentiometric measurements (please write correctly and concisely).

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ch the double layer per second per second that a single atom c Esuming that the atom occupi