2. -3.33 points My Notes I WebAssign GenChem1 6.EX 009 A voltaic cell contains t

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2. -3.33 points My Notes I WebAssign GenChem1 6.EX 009 A voltaic cell contains two half-cells. One half-cell contains a chromium electrode immersed in a 1.00 M Cr(NO3)3 solution. The second half-cell contains a nickel electrode immersed in a 1.00 M Ni(NO3)2 solution. Crs (aq) 3 e Cr(s) Ered 0.744 V Ni (aq) 2 e Mics) Ered 0.257 v 2+ (a) Using the standard reduction potentials given above, predict the standard cell potential of the voltaic cell. 402 (b) Write the overall balanced equation for the voltaic ce Include states-of-matter under the given conditions in your answer.) Help chem Pad Greek Supporting Materials

Explanation / Answer

(a) Eo(cell) = Eo(Ni2+/Ni) - Eo(Cr3+/Cr)

= -0.257 - (-0.744)

= 0.487 V


(b) (1) Cr3+(aq) + 3 e- => Cr(s)

(2) Ni2+(aq) + 2 e- => Ni(s)


Reverse equation (1):

(3) Cr(s) => Cr3+(aq) + 3 e-


Add 2 x equation (3) + 3 x equation (2):

2 Cr(s) + 3 Ni2+(aq) + 6 e- => 2 Cr3+(aq) + 3 Ni(s) + 6 e-


Cancel electrons to get overall cell reaction:

2 Cr(s) + 3 Ni2+(aq) => 2 Cr3+(aq) + 3 Ni(s)

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