Sapling Learning A galvanic (voltaic) cell contains a copper cathode immersed in

Question

Sapling Learning A galvanic (voltaic) cell contains a copper cathode immersed in a copper chloride solution and a nickel anode immersed in a nickel(ll) chloride solution. The two solutions are connected with a salt bridge. Write the balanced equation for the galvanic cell Phases are optional. A current of 2.08 A is observed flowing through the cell for a period of 2.12 hours. Calculate the amount of charge flowing through the circuit during this time Calculate the number of moles of electrons flowing through the circuit during this time. mol e Calculate the mass change in grams of the copper and nickel electrodes. Copper Electrode Nickel Electrode AO Previous 0 Next save And about us careers partners privacy polcy terms of use contattus help anything

Explanation / Answer

A)

the balanced reaction

Cu2+ + 2 e Cu(s) +0.337

Ni2+ + 2 e Ni(s) 0.25

Ni(s) + Cu2+ + 2 e Cu(s) + Ni2+ + 2 e

The reaction:

Ni(s) + Cu2+ Cu(s) + Ni2+

B)

the total charge

Ctotal = I*t= (2.08)(2.12*3600) = 15874.56 C

C)

mol of e-

1 mol of e- = 96500 C

15874.56 C --> x mol

x mol = 15874.56/96500 = 0.16450 mol of e-

D)

mass change:

mol of e- --> 0.16450/2 = 0.08225 mol of Cu+2 --> Cu(s)

mass of Cu = mol*MW = 0.08225*63.5 = 5.222875 g of copper increase

mass of Ni = mol*MW = 0.08225*58.6934 = 4.827 g of nickl decrease

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