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Solubility Product

The [Ag+] i...

Question

The $[A g^{+}]$ in a saturated solution of $A g_{2} C r O_{4}$ is 4 x $10^{- 4}$ mol/L. Find $K_{s p}$ of $A g_{2} C r O_{4}$ .

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Solution

$[A g^{+}] = [C r O_{4}] = 4 \times 10^{- 4} M$
$A g_{2} C r O_{4} ⇌ 2 A g^{+} + C r O_{4}^{2 -}$
$K_{s p} = [A g^{+}]^{2} [C r O_{4}^{2 -}]$
$= (4 \times 10^{- 4})^{2} (4 \times 10^{- 4})$
$K_{s p} = 64 \times 10^{- 12} = 6.4 \times 10^{- 11} (m o l / L)^{3}$

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