Can you please show all work and give an explanation. 3) Consider an electrochem
ID: 1068296 • Letter: C
Question
Can you please show all work and give an explanation.
3) Consider an electrochemical cell based on the reaction:
2H+ (aq) + Sn (s) Sn2+ (aq) + H2 (g)
Which of the following actions would change the measured cell potential?
A) increasing the pH in the cathode compartment
B) lowering the pH in the cathode compartment
C) increasing the [Sn2+] in the anode compartment
D) increasing the pressure of hydrogen gas in the cathode compartment
E) Any of the above will change the measure cell potential.
Explanation / Answer
2H+ (aq) + Sn (s) Sn2+ (aq) + H2 (g)
E = Eo - (0.059/n) log { [Sn2+] PH2 / [H+]2} , PH2 = pressure of hydrogen gas
E = Eo - [ (0.059/n) log { [Sn2+] PH2 }- (0.059/n) log [H+]2 ]
= Eo - [ (0.059/n) log { [Sn2+] PH2 }- 2 (0.059/n) log [H+] ]
= Eo - [ (0.059/n) log { [Sn2+] PH2 } + 2 (0.059/n) pH ] [ pH = -log [H+] ]
E = Eo - [ (0.059/n) log { [Sn2+] PH2 } + 2 (0.059/n) pH ]
Therefore,
any changes in pH , [Sn2+] and pressure of hydrogen gas -would change the measured cell potential.
Therefore,
ans = E