ELECTROCHEMISTRY-HOMEWORK 19. What is the shorthand notation that represents the

Question

ELECTROCHEMISTRY-HOMEWORK 19. What is the shorthand notation that represents the following galvanic cell reaction? Pd(s) + Cu(NO3)2(aq) Pb(NO3)2(aq) + Cu(s) A) Pb(s) Pb2+(a) II Cu2+(aq) I Cu(s) C) Pb(s) INO3(a)I NO3 (aq) I Cu(s B) Cu(s)I Cu2 (aa) II Pb2+(aa) I Pb(s) D) Cu(s)I Cu(NO3)2(ag) II Pb(NO3)2(ag) I Pb(s) 20. Using the following standard reduction potentials e3+(aq) + e- Fe2+(aq) Ni2+(aq) +2e-. Ni(s) E+0.77 V E°-426 V calculate the standard cell potential for the galvanic cell reaction given below, and determine whether or not this reaction is spontaneous under standard conditions. Ni2+(aq) + 2 Fe2+(aq) 2 Fe3+(aq) + Ni(s) A) E'--098 V, nonspontaneous C) E° = +0.98 V, nonspontaneous B) E 0.98 V, spontaneous D) E- +0.98 V, spontaneous

Explanation / Answer

19) option A

on the left hand side the one that is oxidised as M /M+n

on th eright hand side the one that is reduced as M+n /M

both separated by a double vertical line respresenting the salt birdge.

Thus it is

Pb(s)/Pb+2 (aq) || Cu+2(aq) /Cu (s)

20)

E0 cell = SRp of the electrode that is reduced - SRp of the electrode that is oxidised

= -0.26V -(0.77) V

= -1.03 V

As the E0 cell is negative the reaction is NONSPONTANEOUS

tHE CLOSEST OPTION IS A

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