Calculate the emf of the cell- Mgs - Mg2- 0-2 M- Ag-1- 10-3-Ag EAg- -Ag- - -0-8 volt- EMg2-Mg- - -2-37 voltWhat will be the effect on emf if concentration of Mg2- ion is decreased to 0-1 M

E^∘_Cell = E^∘_Cathode E^∘_Anode = 0.80 ( 2.37) = 3.17 volt Cell reaction, Mg + 2Ag^+→ 2Ag + Mg^2+ E_cell = E^∘_Cell 0.0591nlogMg^2+[A ...

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EMF

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Question

Calculate the emf of the cell.
$M g (s) | M g^{2 +} (0.2 M) ∥ A g^{+} (1 \times 10^{- 3}) | A g$
$E_{A g^{+} | A g}^{\circ} = + 0.8 v o l t, E_{M g^{2 +} | M g}^{\circ} = - 2.37 v o l t$
What will be the effect on emf if concentration of $M g^{2 +}$ ion is decreased to $0.1 M$

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M g^{2 +}

10^{- 6} M

25^{o} C

M g (s) | M g^{2 +} (a q, 0.2 M) | | A g^{+} (a q, 1 \times 10^{- 3}) | A g (s)

E_{A g^{+} / A g}^{0} = + 0.8 V

E_{M g^{2 +} / M g}^{0} = - 2.37 V

M g (s) | M g^{2 +} (0.1) | | A g^{+} (1 \times 10^{- 3}) | A g

E_{A g^{+} / A g}^{\circ} = + 0.8 volt, E_{M g^{2 +} / M g}^{\circ} = - 2.37 volt

\frac{R T}{F} = 0.0591 V

E^{\circ} (S R P)

E_{C u^{2 +} / C u}^{\circ} = 0.34 v o l t; E_{Z n^{2 +} / Z n}^{\circ} = - 0.76 v o l t

E_{A g^{+} / A g}^{\circ} = 0.8 v o l t; E_{M g^{2 +} / M g}^{\circ} = - 2.37 v o l t

Δ G^{\circ}

(E_{c e l l}^{0})

M g^{2 +} + 2 e^{-} \to M g (s); E^{0} = - 2.37 V

A g^{+} (a q) + e^{-} \to A g (s); E^{0} = + 0.80 V

M g_{(s)} + 2 A g_{(a q)}^{+} \to M g_{(a q)}^{2 +} + 2 A g_{(s)}

E_{M g^{2 +} / M g}^{0} = - 2.37 V

E_{A g^{+} / A g}^{0} = 0.80 V

[M g^{2 +}] = 0.001 M; [A g^{+}] = 0.0001 M

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