Answer to Question #204773 in General Chemistry for Rajay Myrie

Question #204773

A. Using the following standard reduction potentials: Ag+ (aq) + e- ⇌ Ag (s) E o = +0.80 V Pb2+ (aq) + 2e - ⇌ Pb (s) Eo = -0.13 V i. Write a balanced redox reaction that represents the overall cell reaction for the feasible galvanic cell. ii. Calculate the standard cell potential. iii. Draw a fully labelled galvanic cell for this redox system. Your labels should show (but not limited to): the electron and ion flow; the anode and cathode, the half cells where oxidation and reduction take place. B. Describe the process involved in electroplating a silver coin.


1
Expert's answer
2021-06-09T12:54:28-0400

Ag+ (aq)+ e-⇌ Ag (S) Eo= +0.80 V

Pb2+ (aq) + 2e-⇌ Pb(S) Eo= -0.13 V


(i)

Balanced redox reaction that represents the overall cell reaction for the feasible galvanic cell is:-

Pb(S) +2Ag+(aq) Pb2+(aq) +Ag(S)


(ii)Ag+ (aq)+ e-⇌ Ag (S) Eo= +0.80 V -Cathode

Pb2+ (aq) + 2e-⇌ Pb(S) Eo= -0.13 V -Anode

Eocell=Eocathode-Eoanode


=0.80V-(-0.13)V=0.93V

Standard cell potential =


(iii)





Electroplating is the process of applying a layer of metal or non-metal onto a metallic surface usually for decorative purposes or for protecting them from corrosion. The electrolysis process is employed for plating the metal. 

 

In silver plating, the object to be plated i.e. the coin is made from the cathode of an electrolytic cell. While the anode is the silver bar and the electrolyte used is silver cyanide (AgCN). When current is passed through the cell, positively charged silver ions (Ag+) from the silver cyanide migrate to the negative anode (the coin). These ions are neutralized by electrons and stick to the coin as silver metal. 

The anode bar dissolves to replenish silver ions in the solution which is transferred to the coin until a desired coating thickness is built-up on the coin surface. 





Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!

Leave a comment

Ask Your question

LATEST TUTORIALS
New on Blog
APPROVED BY CLIENTS