Electra - -Hmm- this looks tricky-At 25- CCr -3- e -ightarrow Cr -2- - given - E -0-0-424 - V -Cr -2-2 e -ightarrow Cr s - - given E -0-0-9 - V 1Find - E -0 at - 25-circ C - for - Cr -3- aq -3 e - rightarrow -Cr s Electra was completely stumped- Seems like you need a way to add electrode potentials- Please tell her the answer-A- -1-324 VB- -0-476 VC- 0-741 VD- -0-741 V

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Gibb's Energy and Nernst Equation

Electra - "Hm...

Question

Electra - "Hmm, this looks tricky"

At $25^{\circ} C$ ,
$C r^{3 +} + e^{-} \to C r^{2 +}, g i v e n E^{0} = - 0.424 V C r^{2 +} + 2 e^{-} \to C r (s), g i v e n E_{0} = - 0.9 V F i n d E^{0} a t 25^{\circ} C f o r C r^{3 +} (a q) + 3 e^{-} \to C r (s)$

Electra was completely stumped. Seems like you need a way to add electrode potentials. Please tell her the answer.

0.741 V

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- 0.741 V

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-1.324 V

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-0.476 V

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25^{\circ} C

C r^{3 +} + e^{-} \to C r^{2 +}, g i v e n E^{0} = - 0.424 V C r^{2 +} + 2 e^{-} \to C r (s), g i v e n E_{0} = - 0.9 V F i n d E^{0} a t 25^{\circ} C f o r C r^{3 +} (a q) + 3 e^{-} \to C r (s)

25^{\circ} C

C r^{3 +} + e^{-} \to C r^{2 +}, g i v e n E^{0} = - 0.424 V C r^{2 +} + 2 e^{-} \to C r (s), g i v e n E_{0} = - 0.9 V F i n d E^{0} a t 25^{\circ} C f o r C r^{3 +} (a q) + 3 e^{-} \to C r (s)

E^{0}

C r^{2 +} (a q) + 2 e^{-} \to C r (s)

E^{0}

C r^{3 +} (a q) + e^{-} \to C r^{2 +} (a q); E^{0} = - 0.41 V

C r^{3 +} (a q) + 3 e^{-} \to C r (s); E^{0} = - 0.74 V

M^{2 +} / M and M^{3 +} / M^{2 +}

E^{0}

C r^{2 +} (a q) + 2 e^{-} \to C r (s); E^{0} = - 0.91 V C r^{3 +} (a q) + e^{-} \to C r^{2 +} (a q); E^{0} = - 0.41 V

M n^{2 +} (a q) + 2 e^{-} \to M n (s); E^{0} = - 1.2 V M n^{3 +} (a q) + e^{-} \to M n^{2 +} (a q); E^{0} = + 1.51 V

F e^{2 +} (a q) + 2 e^{-} \to F e (s); E^{0} = - 0.44 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q); E^{0} = + 0.77 V

Z n^{2 +} (a q) + 2 e^{-} \to Z n (s), E^{0} = - 0.762 V C r^{3 +} (a q) + 3 e^{-} \to C r (s), E^{0} = - 0.740 V 2 H^{+} (a q) + 2 e^{-} \to H_{2} (g), E^{0} = 0.0 V F e^{3 +} (a q) + e^{-} \to F e^{2 +} (a q), E^{0} = 0.77 V

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