Answered: In the video "Sacrificial Anode…

Chemistry for Engineering Students

3rd Edition

ISBN:9781285199023

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter13: Electrochemistry

Section: Chapter Questions

Problem 13.53PAE

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An aqueous solution of an unknown salt of vanadium is electrolyzed by a current of 2.50 amps for 1.90 hours. The electroplating is carried out with an efficiency of 95.0%, resulting in a deposit of 2.850 g of vanadium. a How many faradays are required to deposit the vanadium? b What is the charge on the vanadium ions (based on your calculations)?
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.
The following cell was found to have a potential of 0.124 V: Ag|AgCl(sat’d)||Cu2+ (3.25 10-3 M|mernbrane electrode for Cu2+ When the solution of known copper activity was replaced with an unknown solution, the potential was found to be 0.055 V. What was the pCu of this unknown solution? Neglect the junction potential.
Inert graphite electrodes were used to create Fe2+ and Al3+___ (what were the ions) solutions. A voltage of _9.73___ (battery voltage) Volts was applied to rod, and a piece of aluminum (respectively)_-- (what electrode?) to create this solution in a previously prepared salt water solution. The salt in the water served as was there salt?) a small steel - (why
A steel coupon with an anode surface area of 1000 cm2 is placed in an electrolyte. The corrosion current is measured to be 1 mA. What mass of steel will be lost in 6 hours? What is the corrosion rate in ug/cm2 /day? In mpy? Assume valence of 2 and the atomic weight is 55.847 g/mole.
Determine the corrosion rate ( mpy ) of steel corresponding to 1µA / cm? of current. Following is the composition of alloys. Cr = 21%, density = 7.1 g/ cm', At.wt. = 52.01 g /mol, number of electron = 1 Ni = 8%, density = 8.9 g/ cm', At.wt. = 58.68 g /mol, number of electron = 2 Fe = 70%, density = 7.86 g/ cm', At.wt. = 55.85 g /mol, number of electron = 2 Note : Faradays constant = 96500 coulombs per mole of electrons. C= constant which includes F and any other conversion factor for unites, for instance, C = 0.129 when corrosion rate is in mpy.
(d) Calculate the electrical conductivity of a 6.0 mm diameter cylindrical silicon specimen of 60 mm long in which a current of 0.5 A passes in an axial direction. A voltage of 12.5 V is measured across two probes that are separated by 40 mm. i. Compute the electrical conductivity of the specimen. C12334 ii. Compute the resistance over the entire 60 mm of the specimen using the data in (1).
Give example of sacrificial anodes and noble coating, define the two and give practical application
ELECTROCHEMISTRY: Copper was electroplated from a Cu2SO4 solution onto an electrode with an active surface rea of 3.19 cm2. Determine the thickness (mm) of the deposit if the current is kept constant at 4.53 A for 0.8715 hours. (density of Cu = 8.96 g/cm3, MW of Cu = 63.55 g/mol). (Input values only with 2 decimal places. Do not include the unit.)
ELECTROCHEMISTRY: Copper was electroplated from a Cu2S04 solution onto an electrode with an active surface area of 4.31 cm?. Determine the thickness (mm) of the deposit if the current is kept constant at 3.04 A for 1.0784 hours. (density of Cu = 8.96 g/cm3, MW of Cu = 63.55 g/mol). (Input values only with 2 decimal places. Do not include the unit.)
A piece of corroded steel plate was found in a submerged ocean vessel. It was estimated that the original area of the plate was 18 in.? and that approximately 2.6 kg had corroded away during the submersion. Assuming a corrosion penetration rate of 200 mpy for this alloy in seawater, estimate the time of submersion in years. The density of steel is 7.9 g/cm.
Example: A steel coupon with an anode surface area of 1000 cm? is placed in an electrolyte. The corrosion current is measured to be 1 mA. What mass of steel will be lost in 6 hours? What is the corrosion rate in ug /cm2/day? In mpy? Assume valence of 2, atomic weight = 55.847 g and p = 7.20 x 10°ug/cm3. %3D I = 0.001 mA

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In the video "Sacrificial Anode Materials Demo", which among Zn, Al, Mg served as as i) sacrificial anodes? and ii) as noble coatings?