The equilibrium constant for the reaction Srs - Mg-2aq - Sr-2aq - Mgs is 4 - 1012 at 25o CThe Eo for a cell made up of the Sr-Sr-2 and Mg-2-Mg half cells log 2 - 0-3

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Characteristics of Equilibrium Constant

The equilibri...

Question

The equilibrium constant for the reaction
$S r (s) + M g^{+ 2} (a q) ⇌ S r^{+ 2} (a q) + M g (s)$ is $4 \times 10^{12}$ at $25^{o} C$
The $E^{o}$ for a cell made up of the $S r | S r^{+ 2}$ and $M g^{+ 2} | M g$ half cells (log $2 = 0.3$ )

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Solution

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S r (s) + {M g}^{+ 2} (a q) ⇌ {S r}^{+ 2} (a q) + M g (s)_{+ 2}

2.69 \times 10^{12}

25^{o} C

E^{O}

S r / {S r}^{+ 2}

{M g}^{+ 2} / M q

25^{o}

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

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

E_{{S r}^{2} + / S r}^{o} = - 2.89

B e^{2 +}

M g^{2 +},

S r^{2 +}

C a^{2 +}

[F^{-}]

M g F_{2}

S r F_{2}

K_{s p} (M g F_{2}) = 9.5 \times 10^{- 9}

K_{s p} (S r F_{2}) = 4 \times 10^{- 9}

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