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EMF

Consider the ...

Question

Consider the cell:
$Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u$
The standard reduction potential are 0.350 V for $C u^{2 +} (a q) + 2 e^{-} \to C u$ and -0.763 V for $Z n^{2 +} (a q) + 2 e^{-} \to Z n$ .
The EMF (in V) of the cell is ( write your answer as nearest integer) :

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Solution

EMF of the cell = $E_{c a t h o d e}^{⊝} - E_{a n o d e}^{⊝}$
$= E_{C u^{2 +} | C u}^{⊝} - E_{Z n^{2 +} | Z n}^{⊝}$
$= 0.350 - (- 0.763) = 1.113 V$

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Similar questions

Consider the cell:

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u

The standard reduction potential are

0.350

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

- 0.763

Z n^{2 +} (a q) + 2 e^{-} \to Z n

The cell reaction is:

Consider the cell:

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | | C u

The standard reduction potential are 0.350 V for;

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

and -0.763 V for;

Z n^{2 +} (a q) + 2 e^{-} \to Z n

.

Assertion: The reaction is spontaneous.

Reason: The cell potential is positive.

Q. Consider the cell,

Z n | Z n^{2 +} (a q) (1.0 M) | | C u^{2 +} (a q) (1.0 M) | C u

The standard reduction potentials are

+ 0.35 V

2 e^{-} + C u^{2 +} (a q) \to C u^{2 +} (a q) (1.0 M) | C u

The standard reduction potentials are

+ 0.35 V

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

- 0.763 V

2 e^{-} + Z n^{2 +} (a q) \to Z n

Calculate the emf of the cell and tell whether the cell reaction spontaneous or not ?

Q. The standard reduction potential

E^{\circ}

, for the half reaction are:-

Z n \to Z n^{2 +} + 2 e^{-}; E^{\circ} = 0.76 V

C u \to C u^{2 +} + 2 e^{-}; E^{\circ} = 0.34 V

The emf for the cell reaction,

Z n (s) + C u^{2 +} \to Z n^{2 +} + C u (s)

is_____________.

Z n | Z n^{2 +} (a q) | | C u^{2 +} (a q) | C u

E^{o}

C u

Z n

0.35

- 0.76

Find EMF of cell (nearest integer) if

Z n^{2 +}

C u^{2 +}

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