An electrolytic cell is a type of electrochemical cell in which a reaction is fo

Question

An electrolytic cell is a type of electrochemical cell in which a reaction is forced to run in a non-spontaneous direction via the application of an external voltage source. One common example of an electrolytic cell is an electroplating apparatus, in which an external voltage is applied in order to cause metal ions to "plate" out of the solution and coat an electrode with a thin layer of solid metal deposited from the solution.

In a particular electroplating apparatus, solid nickel is plated onto a metal surface from a Ni2+ solution using a current of 50 amps for 8.0 minutes. What mass of solid nickel will plate out in this time?

7.04 x 105 g Ni (s)

Explanation / Answer

Mass of copper Ni ,m = ?

Molar mass of copper M= 58.7 g/mol

time t = 8 min = 8 x 60 s = 480 s

current c = 50 A

valancy of Ni in Ni2+, z = +2

From Faraday's 1st law,

m = Mct/zF where F = Faraday constant = 96485 C/mol

Substitute all the values,

m = (58.7 g/mol) (50 A) (480s)/ (2) (96485 C/mol)

= 7.30 grams

mass of Ni = 7.30 g

Therefore,

mass of solid nickel will plate out = 7.30 g

F = 96520 C/mol

Therefore, value of the Faraday constant = 96520 C/mol

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