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An electrochemical cell is composed of pure nickel and pure iron electrodes immersed in solutions of their divalent ions. If the concentrations of Ni2+ and Fe2+ ions are 0.002 M and 0.40 M, respectively, what voltage is generated at 25°C? (The respective standard reduction potentials for Ni and Fe are −0.250 V and −0.440 V.) (A) −0.76 V (B) −0.26 V (C) +0.12 V (D) +0.76 V

Respuesta :

Answer:C  0.12 V

Explanation:

Given

Concentration of [tex]Fe^{2+} M_1=0.40 M[/tex]

Concentration of [tex]Ni^{2+} M_2=0.002 M[/tex]

Standard Potential for Ni and Fe are [tex]V_2=-0.25 V[/tex]  and [tex]V_1=-0.44 V[/tex]

[tex]\Delta V=V_2-V_1-\frac{0.0592}{2}\log (\frac{M_1}{M_2})[/tex]

[tex]\Delta V=-0.25-(-0.44)-\frac{0.0592}{2}\log (\frac{0.4}{0.002})[/tex]

[tex]\Delta V=0.12\ V[/tex]

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