Calculate the emf of the cell Cr-Cr3-0-1 M-Fe2- 0-01 M- FeGiven- ECr3- Cr- - -0-75 volt- EFe2- Fe- - -0-45 volt-

The correct option is A 1.231 volt Cr|Cr^3+(0.1M)||Fe^2+(0.01M)|Fe E^∘_Cr^2+|Cr=0.75V; E^∘_Fe^2+/Fe= 0.45 V 2Cr^3++3Fe⟶ 3Fe^2++2Cr ∴ ...

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EMF

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Question

Calculate the emf of the cell
$C r | C r^{3 +} (0.1 M) | | F e^{2 +} (0.01 M) | F e$
(Given: $E_{C r^{3 +} / C r}^{\circ} = - 0.75 v o l t; E_{F e^{2 +} / F e}^{\circ} = - 0.45 v o l t)$ .

1.231 v o l t

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1.361 v o l t

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2.461 v o l t

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2.561 v o l t

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Solution

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E_{C r^{3 +} |}^{o}

_{Cr}

= - 0.72 V, E_{F e^{2 +} | F e}^{o} = - 0.42

| C r^{3 +} (0.1 M) ∥ F e^{2 +} (0.01 M) |

E_{C r^{3 +} / C r}^{\circ} = - 0.72 V, E_{F e^{2 +} / F e}^{\circ} = - 0.42 V

C r | C r^{3 +} (0.1 M) | | F e^{2 +} (0.01 M) | F e

E_{C r^{3 +} / C r}^{\circ} = - 0.72, E_{F e^{2 +} / F e}^{\circ} = - 0.42 V

C r | C r^{3 +} (0.1 M) | | F e^{2 +} (0.01 M) | F e

298 K

2 C r (s) + 3 {F e}^{2 +} (0.1 M) \to 2 {C r}^{3 +} (0.01 M) + 3 F e (s)

E ({C r}^{3 +} | C r) = - 0.74 V E ({F e}^{2 +} | F e) = - 0.44 V

Given, $E_{C r^{3 +} / C r}^{0} = - 0.72 V, E_{F e^{2 +} / F e}^{0} = - 0.42 V$

The potential for the cell

C r | C r^{3 +} (0.1 M) | | F e^{2 +} (10.0 M) | F e

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