View assig tProblemID-68038284 CHEM 2320-1 Analytical Chemistry 16SP signed in a

Question

View assig tProblemID-68038284 CHEM 2320-1 Analytical Chemistry 16SP signed in as Henry Problem 2065 previous l 17 of 17 I rebum t Problem 20.65 Part A What is the emf of this cell under standard condions? Exp A voltaic c is that uses the following reaction and operates at 298 Express your answer using two significant figures. Zn (s) Ni (aa)- Zn (ag) +Ni(s) 0.53 Submit Incorrect: Try Again; 4 attempts remaining Part B What is the ent of this cell when Ni? 200 Mand Zn? a 160 M7 Express your answer using two significant figures. F16 Example d

Explanation / Answer

E°cell = Ecathode - Eanode

so

Zn2+ + 2 e Zn(s) 0.7618 --> it oxidizes

Ni2+ + 2 e Ni(s) 0.25 --> it reduces

E°cell = -0.25 - -0.7618 = 0.5118 V

B)

nernst equation:

Ecell = E°cell - 0.0592/n*log(Q)

Q = [Zn2+]/[Ni2+]

Q = (0.16)/(2) = 0.08

Ecell =0.5118 - 0.0592/2*log(0.08)

Ecell = 0.5442

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