Question

For the following electrochemical cell:

Co(s)/Co^2+(aq,0.0155M)//Ag^+(aq,2.50M)/Ag(s)

Write the net equation:______________

Calculate the following values at 25 degrees celcius using the standard potentials:

E standard cell ________V

E cell _____________V

Answer 1

Ag⁺ + e^-$\rightarrow$ Ag                E^o = +0.7996

Co $\rightarrow$ Co²⁺ + e^-              E^o = +0.28

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Ag⁺ + Co $\rightarrow$ Ag + Co²⁺   E^o = 0.7996 + 0.28 = 1.0796 V = E standard cell

Q = [Co²⁺]/[Ag⁺] = (0.0155)/(2.50) = 6.2 $\times$ 10^-3

E = E^o - (0.0591/n)log Q

E = 1.0796 - (0.0591/2) log (6.2 $\times$ 10^-3) = 1.144 V = E cell