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46 solutions

Faraday's Constant

Q. Copper can be electroplated at the cathode of an electrolysis cell by half-reaction: Cu2+(aq) + 2 e- → Cu(s) What is the amount of current that flows in the cell when the electrolysis is conducted for 180 seconds to plate 325 mg of copper?

Solved • Dec 5, 2019

Faraday's Constant

Q. An electric current transports 0.60 kC of charge in 271. milliseconds. Calculate the size of the electric current. Be sure your answer has the correct unit symbol and the correct number of significant digits.

Solved • Nov 20, 2019

Faraday's Constant

Q. Purification of copper can be achieved by electrorefining copper from an impure copper anode onto a pure copper cathode in an electrolytic cell. How many hours will it take to plate 11.5 kg of copper onto the cathode if the current passed through the cell is held constant at 38.5 A? Assume the copper in the electrolytic solution is present as Cu2+ .

Solved • Nov 23, 2019

Faraday's Constant

Q. 7. A constant electric current deposits 0.536 g of silver metal in 12960 seconds from a solution of silver nitrate. What is the current? What is the half reaction for the deposition of silver?

Solved • Oct 3, 2019

Faraday's Constant

Q. 6. A current of 4.27A is passed through an electrolytic cell containing molten CaCl2 for 4 hours, what are the products produced at the anode and cathode? How much product (in moles and grams) will be produced at the anode and cathode?

Solved • Oct 3, 2019

Faraday's Constant

Q. 4. Determine the oxidation number of the chromium atoms in a chromium salt if electroly a molten sample of this salt for 2.50 hours with a 7 ampere current deposits 9.71 grams of chromium metal at the cathode.

Solved • Oct 3, 2019

Faraday's Constant

Q. 3. Calculate the volume of H2 gas at 25 degrees C and 1 atm that will collect at the cathode when an aqueous solution of Na2SO4 is electrolyzed for 3 hours with a 10.0 ampere current?

Solved • Oct 3, 2019