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  • The standard oxidation potential of zinc is 0.76 volt and of silver is -0.8 volt . Find the emf of the following cell: <img alt="\begin{matrix} Zn & | & Z n \left(N O_{3}\right)_{

The standard oxidation potential of zinc is 0.76 volt and of silver is -0.8 volt . Find the emf of the following cell:

\begin{matrix} Zn & | & Z n \left(N O_{3}\right)_{2} & ||& AgN O_{3}&| & Ag &\ a t \: 25^{\circ} \\ && 0.5 M & & 0.5 M & \end{matrix}

Option: 1

1.55


Option: 2

1.51


Option: 3

1.49


Option: 4

1.57


Answers (1)

best_answer

Cell reaction :

Zn + 2Ag ^+\rightarrow 2Ag + Zn ^{2+ }

Now,

E_{cell}^{0}= 0.76+0.80= 1.56V

E_{cell} = E_{cell}^{0} - \frac{0.0591}{2} log \frac{[product]}{[reactants ]}, as ..n= 2

E_{cell}= 1.56 - \frac{0.0591}{2} log \frac{0.5}{0.5\times0.5}

\\= 1.56 - 0.00889\\= 1.55

Posted by

Rakesh

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