Electrochemical Thermodynamics
An iron sample (surface area of 3.3 cm^2) was protected by nickelization in a solution containing 0.1 M NiSO4 and 1 M H2SO4 at a current of 0.28 A for 30 min. Question: What will be the sample weight increase after the process of nickelization upon 62% current efficiency? Please show step by step solution.
A silver-20% gold alloy sample (1 cm diameter and 0.2 cm height) is subjected to a selective silver dissolution in 0.1 M HNO3 at current density of 1 mA/cm^2. Question: How long will it take until the total amount of silver is dissolved? Assume the average density of 8 g/ cm^3 for the alloy sample.
How long will it take to dissolve 2 mg of metal A (atomic weight 100) in a solution containing A^2+ from a metal electrode with area of 1.5 cm^2 at an overpotential of n = 0.2 V? The exchange current density (jo) for A is 3x10^-3 A/cm^2, the temperature T=298 K and the symmetry factor Beta=0.4. What will be the final overpoten ...continues
Diffussion controlled electrolysis
Diffussion controlled electrolysis proceeds on (a) planar and (b) spherical electrode under the conditions: n = 1, C = 1 mM, A= 0.04 cm^2, D = 1.5x10^-5 cm^2/s. Calculate the current (i) in both cases at t = 0.5, 1, 3, 10 sec. How long can the electrolysis proceeed before the current at the spherical electrode exceeds that ...continues
Calculate the diffusion limiting current for the oxidation of an organic compound at an electrode in stagnant solution. Assume 6 electrons are involved in the reaction (n=6). C(org) = 0.01 M, D(org) = 2x10^-5 cm^2/s. Calculate the transition time (tau) for the system at a current density of 0.3 A/cm^2.
Consider the electrode reaction O + e- = R. Under the conditions Cr=Co= 1mM, K^o=10^-7 cm/sec, Beta = 0.3: Calculate the exchange current density jo [uA/cm^2]
The following data were obtained for the reduction of metal ions A+ to metal A in a stirred solution at a 0.1 cm^2 electrode; the solution contained 0.01M A+. n(mV) -100 -120,-150, -180, -220, -280, -370, -500, -600 i(uA) -45.9, -62.6, -100, -170, -300, -510, -770, -965, -965 Calculate the exchange current density jo[uA/ ...continues
The Relation of Oxidation-Reduction to Electric Cells and Electrolysis
Please see the attached Word document to view the problem. Please show all work. Thanks a lot!
Please see the attached Word document to view the problem. Please show all work for all questions 2 - 4.
The Corrosion of Iron, a Daniell cell, and Electrolysis of KI
1. Why would a "tin" cane (iron plated with tin) rust more easily whan a galvanized pipe (iron coated with zinc), when both are exposed to weathering? 2. Why are cans of tin plate, rather than of galvanized iron, used for preparing fruits and other food products? 3. When zinc dust is mixed with 1 F CuSO4, the solution b ...continues
